Library · 174 modules online

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The latest 10 added

The Hard Questions Face 100 deep moral dilemmas. Cast your vote, see global and country percentages, and explore timeless philosophical perspectives. Live Oct 2026 Walk to Satoshi Walk the right path and win one million Bitcoin! (Kind of) · Walk the 256-bit binary tree to Satoshi's vault Live Sep 2026 Country Battle Two countries, one question · which is larger, which has more people, which became independent first. The reveal gives both figures Live Aug 2026 Match the Number Count scattered objects, read ten-frames, and name shaded fractions · pick the number that matches what you see Live Jul 2026 Rule 30 A single cell cascades into structured chaos under Wolfram's Rule 30 · the seashell pattern. Seed a row, then step or play it downward Live Jul 2026 Langton's Ant Watch one ant follow two rules from chaos into an emergent highway. Flip cells, then step or play the classic Langton automaton Live Jul 2026 Ancient Wisdom Complete a timeless proverb or maxim, then meet a sourced context card · its meaning, its origin, and how sure we are who said it Live Jul 2026 Game of Life A serene cellular automaton · watch Conway's classic B3/S23 rule unfold. Load a pattern, toggle cells, then step or play generations Live Jul 2026 Connect the Dots The classic ordered dot-to-dot · tap or drag the numbered dots in order and watch a hidden picture snap into shape, dot by dot Live Jul 2026 Solve for x Isolate x on a balance · every inverse operation you pick hits both sides at once, and every intermediate equation is shown step by step Live Jul 2026

Library

By age:

Memory

5 games

Memorize pi, e, and 38 mathematical constants using the numpad path method

Match emoji cards with their word labels across 10 categories

Watch the color sequence light up, then repeat it. Train your visual memory with up to 12 colors

Train your ear on a piano · random tone sequences for pitch memory, or learn a famous public-domain melody three notes at a time

Memorize a grid of emojis, then spot the missing one. How many rounds can you survive?

Knowledge

19 games

Learn world capitals, flags, and geography through interactive map quizzes

Put items in order · historical events by date, planets and animals by size, or rank by an objective value. Pick the topic mix

Three modes on one historical pool: pick the year an event happened, who was responsible, or which deed belongs to a given person

Look up how rare your name is in the US top 1000, then play streaks guessing which of two names is rarer. The gap shrinks as you climb

Which Philosophy?

A famous philosophical statement appears · pick the philosophy or movement it represents. Filter by category (ethics, epistemology, mind…)

Master the periodic table of elements. Identify elements by symbol, atomic number, and properties

Learn world leaders and their tenures. Test your knowledge of historical and current leadership timelines

Classify the Era

Classify artworks and objects by their historical era. Distinguish Renaissance from Baroque from Modernist

Two graphs over time · pick which curve is the real shape of a phenomenon, from world population to a year of rainfall

Guess the Country

Three escalating facts narrow it down · geography first, economy next, landmark last. Score higher the earlier you commit

Two countries, one question · which is larger, which has more people, which became independent first. The reveal gives both figures

Match public holidays to their date, religion, or country. Filter by Christian, Muslim, Jewish, Hindu, or Secular

Recognize famous paintings, melodies, and book titles by their creator. Three topic pools, a best streak for each

Spot the true statement or fill the missing word · facts, fun trivia, and how-it-works explanations. Four modes, one streak

A shape appears · circle, hexagon, rhombus, trapezoid · and you pick its name. Geometry vocabulary, one tap at a time

Mix two things and pick what you get · red and blue make purple, grapes become wine. Colours and kitchen transformations

How long until it is gone? Guess how long everyday things take to decompose · from banana peels to glass bottles

And the Question Is

You get the answer · pick the question it answers. Inverted trivia across history, science, geography, math and everyday life

Strategical History

Read a real grand-scale decision from history · a campaign, market entry or national policy · then pick the move history proved right

Words

18 games

Doctor is to hospital as teacher is to ___ ? Train verbal reasoning through word-pair relationships

What does this word mean? Pick the correct meaning from the options. Vocabulary in all 25 languages

Study vocabulary between any two of 25 languages · learn by emoji to word, word to emoji, or word to word

Read words in reverse. See DOG, pick GOD from the list. Millisecond timer, 25 languages

Solve classic, logic, math, and wordplay riddles. Pick difficulty, type, and how many choices. Streak mode

Is it a famous quote, a classic proverb, or just AI-generated slop? Test your intuition against the machines

Complete a timeless proverb or maxim, then meet a sourced context card · its meaning, its origin, and how sure we are who said it

Guess what an archaic curse or insult once meant, then learn its history · a word that scandalised long ago and offends no one now

Guess the secret word in 6 attempts · green for correct, yellow for wrong spot, grey for absent. Three difficulty tiers

Guess the word one letter at a time before the stickman is drawn. Easy 4-letter, medium 5-letter, hard 6+ letter pools

Form words using only the letters in the grid. Every grid contains at least one pangram. Anagram pool puzzle, not a word search

Intersecting word puzzles · direct definitions on Easy, synonyms on Medium, cryptic clues on Hard

Real-time WPM and accuracy on a 200+ poem-excerpt library. Single words, sentences, or whole stanzas. Physical and mobile keyboards

Explore Plutchik's Wheel of Emotions. Match complex emotions to their component feelings or identify the more intense form

Read a short passage from a famous book and name the emotion it conveys

Two sentences, one blank · pick the connector (however, therefore, meanwhile) that bridges them logically

A famous passage stops just before a character reacts · guess what the book says they did next

Read Upside Down

Match a word across a 180 degree flip · rotated prompt or rotated answers, with look-alike letter traps. 25 languages

Numbers

11 games

A lab of timed number drills · arithmetic, trigonometry, prime spotting and fraction sizing, each on its own tab

What comes next? Spot the pattern in number sequences - arithmetic, geometric, Fibonacci, and more

Spot the cell where only one digit fits. Forced-move Sudoku micro-puzzles, validated by row, column, and box

Split your ideal 24 hours across sleep, work, study, fun, family and me-time · then compare it to country averages

A sheet of paper is 0.1 mm thick and every fold doubles it · guess how many folds reach a giraffe, Everest or the Moon

Solve quick math while catching timed bell events without dropping the rhythm

Keep a running tally of positive and negative values flashed at speed

Test your number sense across three lenses: wild comparisons, product estimation, and volume guessing. All in one streak

Real objects, real numbers · calculate the circumference, area, volume and radius of pizzas, doors and footballs

Isolate x on a balance · every inverse operation you pick hits both sides at once, and every intermediate equation is shown step by step

Match the Number

Count scattered objects, read ten-frames, and name shaded fractions · pick the number that matches what you see

Finance

1 game

Train candlestick patterns, options Greeks, stock valuation, compound interest, and probability in one place. Pick which topics to drill

Reasoning

19 games

How many x is y worth? Use exchange-rate clues to deduce one emoji's value in terms of another · multi-step mental math and transitive logic

Flag the unrevealed cell that must be a mine. Constraint-satisfaction deduction, cheat-proof validation

Mastermind Deduce

Crack the secret code from past guesses and peg feedback. Pure deductive reasoning, cheat-proof validation

The Hard Questions

Face 100 deep moral dilemmas. Cast your vote, see global and country percentages, and explore timeless philosophical perspectives.

Schedule Conflict

Resolve a meeting time from five people and contradictory constraints

A handful is drawn from one hidden bag · reason backward to its most likely source

Logical Fallacies

Spot the flaw in reasoning or match a famous fallacy to its definition

Clues are found at the scene · pick the one suspect whose marks explain every clue

Predict which structure carries the load · bridges, towers, cranes and dams, every answer decided by exact physics

A few clues describe one secret number · cross out every option that breaks a clue and the one left standing is the answer

Circuit Breaker

Choose the logic gate · AND, OR or XOR · that turns the two inputs into the target output

Switch wires on and off to send exactly the right power through the network and grow the bulb to full

Given the rotation of the first gear, work out which way the last gear in the chain turns

A stone coasts to a stop · call the zone it lands in before it settles. Call it early while it is still fast to chase a faster reaction time

Deduce the hidden rule by probing fixed inputs. Watch what comes out of the box to crack the logic

Two absurd contenders, one defensible winner · pick who wins, then see the maths that settles it (mass, energy, biomass, attrition)

One button, a hidden reward rule. Experiment, then make the call · real pattern or pure chance?

Two absurd contests · one side breaks, melts or gives up. Predict it, then see the physics math that settles it

Water, oil, honey and juice race down criss-crossing tubes · predict which pour reaches the bottom first, then watch the race

Puzzles

10 games

Pick the move that delivers checkmate in one. Pure board reasoning, cheat-proof validation, streak mode

Pick the domino that fits the gap. Pure logic deduction based on matching adjacent numbers in a chain

Block cells on a hex board to wall the cat in before it slips off the edge. A pure logic puzzle · bigger board, fewer head-start walls

Move all disks from the first peg to the third using the minimum number of moves. Classic recursive puzzle, 3 to 7 disks

Traveling Salesman

Visit every city once and loop back home on the shortest possible route · match the optimum to win, and the map gains a city as you climb

Place bulbs to light every cell · no two bulbs see each other and numbered walls count their neighbours. A classic light-up logic puzzle

Divide the grid into rectangles · each one holds a single number equal to its area. A clean area-partition logic puzzle

Draw one closed loop · each number says how many of its four edges the loop uses. A pure edge-deduction puzzle

Connect the islands with bridges · each island takes exactly its number, none crossing, all joined into one network

Rotate every tile until all the pipes join into one seamless, leak-free loop. A calming connect-the-path puzzle

Spatial

9 games

Learn the layer-by-layer method with an interactive 3D cube and a notation drill

Draw a circle, square, triangle, pentagon or hexagon freehand in one stroke · we score how close to perfect you got

Memorize a path on a grid, rotate the board, then recreate the transformed route

Spin the mirrors to bounce the always-firing laser into the goal, one more mirror each shot you clear

Spatial Reasoning

Mental rotation, net folding, and shadow projection in one place. Three visual-spatial challenge types, one streak

Several arrows fan out from one point · add them tip to tail and judge which way the combined arrow points

A small cube piece, then a bigger block built from copies of it · work out how many pieces fit inside

Where on the Map

Stand at the house, follow step-by-step directions across a small map, and land on the right place. A spatial memory game

Only the corner dots of a 3D solid remain · reconnect the dots to draw its missing edges and complete the named shape

Observation

11 games

The word says RED but the ink is blue. Name the ink, or flip to reverse mode and read the word

Find Differences

Two emoji walls, K differences. Spot every altered cell on the bottom wall · 100 to 500 emojis, 1 to 20 differences

A famous painting paints itself row by row from coloured-emoji squares. Guess the work before the scanline finishes

Spot the camouflaged digit or letter as it fades into the background. An Ishihara-style plate as a streak game

See a black silhouette · pick what it is. 100 famous animals, foods, vehicles and places. Outline-recognition in 25 languages

Find MemPi the mascot hiding in a wall of coral, red and pink emojis. The higher the difficulty, the more the decoys blend in

Watch which cup hides the ball, follow it through a quick shuffle, then tap the right one. More cups and swaps as difficulty climbs

Moles pop up around the grid · tap them before they duck back and hit the target before time runs out. Faster and bigger as you climb

A beat-the-clock CAPTCHA speedrun · read distorted codes, pick the right tiles, spot the tilt and tap in order. Race your own personal best

Eight soft piano tones, then eight more with a longer silence between them · nothing to score, and nothing to get wrong

Connect the Dots

The classic ordered dot-to-dot · tap or drag the numbered dots in order and watch a hidden picture snap into shape, dot by dot

Silly

2 games

A digital sheet of bubble wrap · tap every bubble before the timer runs out. Harder rounds mean a bigger sheet and a tighter clock

Scratch off a grid of foil cells. Uncover enough of the prize symbol before you reveal too many blanks · quick nerve-and-luck game

Completion

7 games

A recipe step appears with one word missing · an amount, temperature, or technique. Pick the right word and build a streak

A sentence about a historical event appears with one word missing · a year, place, or name. Pick the right word and build a streak

A science or nature fact appears with one word missing · a number, name, or process. Pick the right word and build a streak

Geography Blanks

A world-geography fact appears with one word missing · a capital, river, or country. Pick the right word and build a streak

A famous quote or saying appears with one word missing. Pick the right word to complete it and build a streak

A fact about a famous film appears with one word missing · a character, year, or title word. Pick the right word and build a streak

A sports fact or rule appears with one word missing · a number, team, or record. Pick the right word and build a streak

Idle

3 games

A serene cellular automaton · watch Conway's classic B3/S23 rule unfold. Load a pattern, toggle cells, then step or play generations

Watch one ant follow two rules from chaos into an emergent highway. Flip cells, then step or play the classic Langton automaton

A single cell cascades into structured chaos under Wolfram's Rule 30 · the seashell pattern. Seed a row, then step or play it downward

Polymath

9 games

Walk a fog-of-war maze and beat short encounters drawn from every other game. The polymath gauntlet · difficulty ramps every level

Cross-game streak roulette drawn from the whole PlayMemorize catalogue. Pure full-spectrum test · every round can be any game

Cross-game streak restricted to arithmetic, unit conversion, number sequences, and forced-move Sudoku

Knowledge Polymath

Cross-game streak restricted to geography, polyglot vocabulary, facts, definitions, and backwards-reading

Memory Polymath

Cross-game streak restricted to memorisation · digits of pi, emoji cards, colour sequences, and ghost

Reasoning Polymath

Cross-game streak across pattern, deduction, and abstraction · matrix, analogies, Stroop, riddles, chess mate, mastermind

Six grid constraint puzzles in one hub: Akari, Shikaku, Nurikabe, Slitherlink, Bridges, and Infinity Loop. Pick your puzzle

Pattern Recognition

Four pattern challenges in one place: matrix reasoning, odd-one-out, rule induction, and mirror symmetry. Pick a mode

Wordle, Hangman, and Word Square in one place · guess the hidden word, save the stickman, or build words from a letter grid

Life Hacks

1 game

A growing library of genuinely useful life hacks · each one checked against a cited, reputable source and shown as a clear visual card

Bitcoin Games

1 game

Walk to Satoshi

Walk the right path and win one million Bitcoin! (Kind of) · Walk the 256-bit binary tree to Satoshi's vault

Tools

3 games

Emoji Typewriter

Type any letter, word, or sentence and watch it spell itself out in random emojis. Copy as PNG or plain-text emoji grid

Roll 1 to 100 dice at once. Big visual grid, running total and average, instant re-roll. Handy for board games, RPGs, and probability

Tap for a random fact · practical and fun, from boiling points to wombat trivia. Roll another or copy it. Works offline

Beta

Games still in the workshop

GeoFrame Explore the world in 360-degree street panoramas · drop your pin on the map and guess the location across 5 rounds Beta Power Law Scatter plots without a trendline · judge whether real observations follow a power law or another distribution Beta Brute Force One button to attack Satoshi's vault · Brute force 256-bit private keys and hunt for Satoshi's 1.1M BTC Beta Fire Starter Flames and heat race through fused paths and metal rods · predict which material sparks the target first Beta In a Day Estimate daily numbers across humanity and planet Earth · test your scale intuition and number sense Beta Column Math Master column addition, subtraction, multiplication, and long division · with and without carries and remainders Beta IQ Puzzle Pro Fit all 12 polysphere pieces into the 2D grid. Rotate, flip, and deduce placements to fill all 55 sockets Beta Shape Slicer Slice 2D shapes by area and 3D solids by volume · stop the cut line or plane at the exact fraction the game asks for Beta Football Angles A pitch from above, one team mate on the ball and opponents in the way · move the free team mate to the spot where the pass is most open Beta Is It Reasonable One short statement about the everyday world · decide if it makes sense, and read why. A common-sense game for children Beta Do Not Think Of It One thing you must not think of, and it is right there on screen · tap the moment the picture goes away. The white-bear study as a game Beta Art Pattern Generated art fills a grid of numbered discs · read the pattern and name the rule that picks them, from even numbers up to primes Beta Front Lines Hold one square on the world map. Spend two points a turn on soldiers or walls, then read the odds before every attack Beta Instrument Assembly Landmark scientific instruments redrawn from the real publications, taken apart · drag every missing part back into place Beta Da Vinci Assembly Leonardo's machines redrawn from the real codex folios, taken apart · drag every missing part back into place Beta Circuit Assembly A classic beginner circuit in standard schematic symbols, taken apart · drag every missing component back into place Beta Toy Assembly Famous toys redrawn from their real patent filings, taken apart · drag every missing part back into place Beta Shape Assembly A classic solid from Euclid's Elements comes apart · drag every missing face back into place Beta Roman Numerals Train conversion and recall between Arabic numbers and Roman numerals Beta Molecule Road Plan a route from a start material to a target · pick one real transformation at a time and watch each product appear on the way Beta NATO Phonetic Master the NATO Phonetic Alphabet. Train rapid spelling and verbal recall of standard code words (Alfa, Bravo, Charlie...) Beta Molecule Mash Pick a real transformation and watch the molecule change · curated, sourced, mass-balanced reactions with a truthful reveal every step Beta Alternative Cost Weigh benefit against cost and pick the option with the least alternative cost · the highest net value (benefit minus cost) Beta Bounce Bounce the ball into the pocket using other balls as bumpers · more balls each shot you clear. Beta Journeys Follow a chain of why, from a sunny afternoon to the early universe, along a calm branching path of short, sourced answers Beta Shape Count Deluxe How many triangles hide in the figure? Every answer is proven by exhaustive enumeration · the reveal lights up each counted triangle Beta Portal Hop Place a pair of linked portals on the walls, then launch the ball · it flies straight, hops through your portals and must hit the target Beta Cheat the System Read a small rule system and spot the loophole · pick the strategy that exploits it, then learn the incentive-design idea behind the flaw Beta Master Percentage Percent of, reverse percent, changes, discounts, tips and chart estimates · every way percentages show up in real life Beta Guess Who? Reveal clues one at a time and find the secret person in an emoji lineup. Guess early on fewer clues for detective bragging rights Beta Library Organizer Shelve real public-domain classics by era, genre, or the author’s literary tradition. A defensible answer every round, in all 25 languages. Beta Compounds Learn what common compounds and alloys are made of. Identify the elements that form water, steel, and more Beta Micro Frustration Endure a pointless gauntlet of fake logins, KYC checks, and 2FA failures. A game of infinite digital friction and absurd requests. Beta Continuum Where does warm sit between freezing and scorching? Slide the marker to place each word on its intensity scale Beta Speed Sort Emojis rain down · drag each one into the right category bin before it lands. Three lives, and it keeps speeding up Beta Rule Flip One card, two rules · top half asks about the letter, bottom half asks about the number. Apply the right one Beta Signal Switch A green leaf asks where it points · an orange leaf asks where it drifts. Read the colour, switch the rule Beta Flanker A row of arrows crowds the screen · report where the middle one points and ignore the flock around it Beta Order It Put the items in the right order along a ranked rail · by distance, date, size or speed · drag them or use the arrows, then check Beta Power Towers Which power tower is larger? Compare exponential stacks using logarithmic logic and number sense Beta Timeline Drag real historical events onto a year-axis · never wrong for a far-off guess, and the exact years are revealed when you finish Beta Inflation A loaf of bread cost 12 cents in 1950 · guess what real old prices are worth in today's money, from the actual CPI Beta Progress Live bars for how far through the year, month, week, day and hour you are · switch time zones, and keep a saved to-do list Beta Human Map A live world map that pulses green for every birth and red for every death · driven purely by real population and birth/death-rate maths Beta Kitchen Life Hacks Source-verified kitchen and food hacks · store, ripen, season and cook the way food science and food-safety authorities recommend Beta Ambush Set your ambush beside the road. An enemy column marches past with a treasure, and one moment lets a soldier cut in and take it Beta Who Composed It? Hear a famous piece of music and name its composer. Classical and public-domain ear training Beta Melody Lab Learn a famous public-domain melody three notes at a time · listen, repeat, and extend until you can play the whole tune Beta Nurikabe Carve numbered islands from a sea of walls · the sea is one connected pool with no 2×2 block. A classic island logic puzzle Beta Loading Click the stack · every 10 clicks open a new loading bar. The bars fill on their own and you open them all · no timer, no way to lose Beta Bullseye Draw the bow by dragging back, then release to loose the arrow · land it in the gold. Too soft falls short, overdraw sails past Beta Shadow Cast A block stands under a light · read the light's direction and pick the flat shadow it casts. Spatial projection, no reading needed Beta Fold Out A flat net sits on the card · pick the 3D solid it folds up into. Cube, pyramid or prism, decided by pure visual-spatial reasoning Beta Volume Estimate Three boxes, three sizes · judge each one by length, width and height and pick the one that holds the most. Pure volume sense, no reading Beta Robot Programmer Build a program of turns and moves, then run it to steer the robot through the maze to the goal · the maze grows the higher you climb Beta Heavy Friction Run a factory line · slide to produce, hire workers and admins to automate, ship to the warehouse and sell, then expand. A tactile idle game Beta Circle Puzzle Tap concentric rings to rotate them and line up every marker before your move budget runs out. More rings and notches as you climb Beta Crocodile Dentist Tap a tooth to check it. Hit a trap and the croc snaps shut. Higher difficulty hides more traps among more teeth · pure suspense Beta