Library · 165 modules online

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The latest 10 added

Random Life HackTap for one random source-verified life hack at a time · a quick, useful tip drawn from every categoryLiveJun 2026 Pet Care HacksSource-verified pet-care tips from the AVMA, ASPCA and AAHALiveJun 2026 Grooming HacksSource-verified grooming and self-care tips from the AAD, ADA and Mayo ClinicLiveJun 2026 Privacy HacksSource-verified digital-privacy and security steps from CISA, the FTC and the EFFLiveJun 2026 Safety HacksSource-verified home-safety and emergency-prep tips from Ready.gov, the NFPA and the Red CrossLiveJun 2026 Gardening HacksSource-verified gardening tips from university cooperative extension servicesLiveJun 2026 Cooking HacksSource-verified cooking techniques from America’s Test Kitchen, Serious Eats and King ArthurLiveJun 2026 Social HacksResearch-backed social and conversation tips from peer-reviewed psychology and UC BerkeleyLiveJun 2026 Car & Commute HacksSource-verified car and commute tips from NHTSA, AAA and fueleconomy.govLiveJun 2026 Organising HacksSource-verified organising and storage methods from professional organizers and method originatorsLiveJun 2026

By age:

Memory

6 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?

Hear a sequence of piano notes, then play it back from memory. Pure pitch-and-order recall that grows as you climb

Knowledge

19 games

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

Spot the one true statement. Math, calendar, and geography facts generated on the fly

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

Guess the Country

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

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

Recognize famous artworks, literary excerpts, and musical compositions by their creators. Three cultural disciplines, one streak

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

Fill the missing word in a practical, true fact · learn something you can actually use, one cloze at a time

Fill the missing word in a quirky, surprising fact · bite-size trivia with a twist

Fill the blank in a short how-it-works explanation · understand the everyday mechanisms behind familiar things

Words

14 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

A classic saying appears with one word missing · pick the word that completes it · quick multiple-choice rounds in your language

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

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

Numbers

12 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

sin, cos, tan - pick the right value for any reference angle. Drills from 0° to 360° across all four quadrants

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

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

Decide fast: prime numbers one way, composites the other

Fractions Faster

Tap the fraction that represents the largest real value

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

Product Estimate

Pick the closest order-of-magnitude answer to a quick product or quantity · number sense over exact arithmetic

Crazy Comparisons

How many hotdogs to cross a football field? Spin the slot machine and guess wild real-world size comparisons

Finance

4 games

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

Read the market like a doctor reads a chart · is a high Shiller PE, a low VIX, or an inverted yield curve good or bad?

Compound Interest

Project how savings grow over time · estimate the balance after compounding and build intuition for exponential growth

Odds & Probability

Read a scenario and pick the more likely outcome · train fast probability intuition for everyday risk

Reasoning

12 games

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 logic black-box · feed inputs, watch outputs, deduce the hidden function. From simple alphabet shifts to positional math rules

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

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

Puzzles

18 games

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

Tap concentric rings to rotate them and line up every marker before your move budget runs out. More rings and notches as you climb

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

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

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

Mirror Symmetry

Find the single pixel or emoji that breaks bilateral symmetry

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

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

Matrix Reasoning

Read the grid of shapes, spot the rule, and pick the tile that completes it. The classic Raven-style abstract-reasoning test

Several items, one rule · find the single one that does not belong. Quick abstract-reasoning rounds

Guess the hidden rule behind a stream of examples, then apply it to the next one. Inductive reasoning under uncertainty

Half a shape sits beside a mirror line · fill the blank half so the whole image is symmetric. Build the reflection, do not just spot it

Strategy & Tactics

1 game

Program each unit's 8 orders, then execute · all units resolve at once over 8 ticks. Flank, charge and shoot to break the enemy line

Spatial

8 games

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

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

Spin the mirrors to bounce the laser into the goal, with 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

Mental Rotation

Decide whether two 3D shapes are the same object rotated, or mirror images. The classic mental-rotation test

Observation

8 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

Silly

3 games

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

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

Polymath

6 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

Tools

25 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

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

Kitchen Life Hacks

Source-verified kitchen and food hacks · store, ripen, season and cook the way food science and food-safety authorities recommend

Travel Life Hacks

Source-verified travel and packing hacks · pack smaller, clear security faster and arrive ready, per airlines, the TSA and travel experts

Source-verified cleaning hacks · clean faster and safer the way the EPA, CDC and appliance makers recommend

Source-verified money habits · save more and avoid fees the way the CFPB, FTC and FDIC recommend

Productivity Hacks

Source-verified focus and productivity methods, each tied to a named originator or real research

Source-verified sleep tips · fall asleep faster and feel sharper, per the CDC, AASM and Sleep Foundation

Phone & Tech Hacks

Source-verified phone and device tips from official Apple, Google and CISA guidance

First-Aid Hacks

Source-verified first-aid and everyday-health basics from the CDC, NHS, Red Cross and AHA

Home Repair Hacks

Source-verified home and repair tips from energy.gov, the NFPA, ENERGY STAR and the USFA

Source-verified laundry and garment-care tips from the American Cleaning Institute, the DOE and makers

Source-verified, evidence-based study techniques drawn from learning-science research

Organising Hacks

Source-verified organising and storage methods from professional organizers and method originators

Car & Commute Hacks

Source-verified car and commute tips from NHTSA, AAA and fueleconomy.gov

Research-backed social and conversation tips from peer-reviewed psychology and UC Berkeley

Source-verified cooking techniques from America’s Test Kitchen, Serious Eats and King Arthur

Gardening Hacks

Source-verified gardening tips from university cooperative extension services

Source-verified home-safety and emergency-prep tips from Ready.gov, the NFPA and the Red Cross

Source-verified digital-privacy and security steps from CISA, the FTC and the EFF

Source-verified grooming and self-care tips from the AAD, ADA and Mayo Clinic

Source-verified pet-care tips from the AVMA, ASPCA and AAHA

Random Life Hack

Tap for one random source-verified life hack at a time · a quick, useful tip drawn from every category

Beta

Games still in the workshop

Expected ValueEstimate the probability-weighted payoff of a bet · weigh upside, downside, jackpots and the rare risk of ruinBeta TimelineDrag real historical events onto a year-axis · never wrong for a far-off guess, and the exact years are revealed when you finishBeta Paper FoldsA sheet of paper is 0.1 mm thick and every fold doubles it · guess how many folds reach a giraffe, Everest or the MoonBeta InflationA loaf of bread cost 12 cents in 1950 · guess what real old prices are worth in today's money, from the actual CPIBeta Perfect DaySplit your ideal 24 hours across sleep, work, study, fun, family and me-time · then compare it to country averagesBeta Which CurveTwo graphs over time · pick which curve is the real shape of a phenomenon, from world population to a year of rainfallBeta Emoji ExplorerPull a lever to wander a branching world of emoji · no goal, just see how many emoji worlds you can exploreBeta Perfect ShapeDraw a circle, square, triangle, pentagon or hexagon freehand in one stroke · we score how close to perfect you gotBeta ProgressLive bars for how far through the year, month, week, day and hour you are · switch time zones, and keep a saved to-do listBeta Human MapA live world map that pulses green for every birth and red for every death · driven purely by real population and birth/death-rate mathsBeta Human TimerA beat-the-clock CAPTCHA speedrun · read distorted codes, pick the right tiles, spot the tilt and tap in order. Race your own personal bestBeta Who Composed It?Hear a famous piece of music and name its composer. Classical and public-domain ear trainingBeta Who Wrote It?Read a famous literary excerpt and identify its author. Recognise voices across the canonBeta Who Painted It?See a famous painting and name the artist who made it. Visual art recognition across movements and centuriesBeta Melody LabLearn a famous public-domain melody three notes at a time · listen, repeat, and extend until you can play the whole tuneBeta NurikabeCarve numbered islands from a sea of walls · the sea is one connected pool with no 2×2 block. A classic island logic puzzleBeta LoadingA loading bar fills up · tap to reset it before it finishes. Each bar you reach starts faster · endless, no levels · how many can you reachBeta BullseyeDraw the bow by dragging back, then release to loose the arrow · land it in the gold. Too soft falls short, overdraw sails pastBeta Shadow CastA block stands under a light · read the light's direction and pick the flat shadow it casts. Spatial projection, no reading neededBeta Fold OutA flat net sits on the card · pick the 3D solid it folds up into. Cube, pyramid or prism, decided by pure visual-spatial reasoningBeta Volume EstimateThree boxes, three sizes · judge each one by length, width and height and pick the one that holds the most. Pure volume sense, no readingBeta Heavy FrictionRun a factory line · slide to produce, hire workers and admins to automate, ship to the warehouse and sell, then expand. A tactile idle gameBeta