Worksheets registry

Merged music trainer · tones (random sequence playback) and songs (melody learning). Audio-only · cannot be represented on paper.

Akari is solved by toggling bulbs on a rendered grid and watching light spread down rows and columns; a static sheet cannot show the illumination the deduction depends on.

Bridges is solved by drawing connections between islands on a rendered board; the no-crossing and single-network rules cannot be conveyed on a static sheet.

But Why? is a cloze explanation mode whose printable form is covered by the Did You Know? worksheet at the hub level, so this card shares that stencil rather than adding one.

Compound Interest generates fresh rates and horizons each round; pinning one scenario to paper loses the estimate-the-growth practice the game is built around.

Crazy Comparisons spins randomised real-world quantities each round; a static sheet would fix a single comparison and lose the spin-and-guess mechanic.

Fun Facts is a cloze trivia mode whose printable form is handled by the Did You Know? worksheet at the hub level, so the standalone card adds no separate stencil.

Infinity Loop is solved by rotating pipe tiles until every connection matches; the rotation mechanic cannot be reproduced on a static printout.

Polymath gauntlet host that dispatches into Geo + Facts + Define. Worksheets are generated per-game.

Polymath gauntlet host that dispatches into Math + Sequences + Convert. Worksheets are generated per-game; the gauntlet has no standalone worksheet form (use the constituent games instead).

Matrix reasoning shows a grid of rendered abstract figures whose relationships must be seen; reproducing the analogies on a static sheet would mean drawing the very figures the player compares.

Melody Lab teaches a tune by ear in growing segments; the listen-and-repeat loop has no meaningful static-paper form.

Polymath gauntlet host that dispatches into Memory + Ghost + Pi. Worksheets are generated per-game.

Mental Rotation needs the player to turn rendered 3D figures in their head and compare them; a flat printed pair cannot stand in for the rotation the task is about.

Mirror Draw asks the player to fill cells to complete a reflection on a rendered grid; the symmetry construction cannot be entered or checked on a static sheet.

Nurikabe is solved by shading cells into walls and islands on a rendered grid; the connectivity rules cannot be conveyed or checked on a static printout.

Odd One Out depends on comparing rendered figures by a shared visual rule; the set cannot be reproduced on paper without supplying the images the player must inspect.

Odds & Probability poses freshly generated chance scenarios; a fixed sheet would reveal the answer set and remove the on-the-fly probability judgement.

"All games" hub page; not a single-round mini-game.

Product Estimate generates fresh quantities each round and rewards order-of-magnitude judgement; a fixed sheet would expose one answer set and lose the timed estimation feel.

Polymath gauntlet host that dispatches into Sequences + Analogies + Riddles. Worksheets are generated per-game.

Rule Induction reveals examples one at a time and updates as you respond; the interactive feedback loop cannot be carried by a fixed printed page.

Shikaku is solved by dragging rectangles across a grid; a printed sheet cannot capture the spatial partitioning, so the puzzle does not survive on paper.

Slitherlink is solved by drawing loop edges between dots on a rendered grid; the single-loop constraint cannot be presented or validated on paper.

Tone Memory is an ear-training game · the challenge is hearing and reproducing pitches, which a silent printed worksheet cannot present.

Useful Facts is a cloze-style trivia mode whose printable form is covered by the Did You Know? worksheet at the hub level, so the standalone card does not duplicate that stencil.

Who Composed It? is an ear-recognition game built on audio excerpts; a silent printed sheet cannot present the music the player must identify.

Who Painted It? shows a rendered artwork the player must recognise; a printed sheet cannot reproduce the paintings the question is built on.

Who Wrote It? presents localised literary excerpts to identify; the passages are the content and are covered by the Who Made This? worksheet at the hub level.

Excluded from worksheets · the game is programming eight simultaneous orders and watching every unit resolve at once, where flanking and timing emerge from the clash. On paper it collapses to "pick the orders that win" against a frozen board, which tests reading a diagram, not the plan-and-resolve loop the game teaches.

Live logic-gate puzzle · the player toggles AND/OR/XOR and reads the output update in real time. A static sheet cannot show the changing OUT value, which is the whole interaction. Hold pending a truth-table stencil design.

Minesweeper-style deduction on a hidden grid. Hidden-state mechanic cannot survive printing (every cell would be revealed at print time).

Logic black-box deduction · the probe-and-deduce loop is the experience, no paper analogue.

Each round is a colour-coded mix of tokens drawn from competing bags; the best-explanation judgment relies on comparing colour proportions that do not reduce to a clean printable stem without colour reproduction.

Grid constraint puzzle hub (Akari, Shikaku, Nurikabe, Slitherlink, Bridges, Infinity Loop). Individual pencil-and-paper puzzles could in principle print, but the hub mixes visual-only (Infinity Loop) with pen-and-paper classics. Hold pending a per-puzzle stencil split.

Mastermind code-deduction. Hidden code + interactive guess feedback IS the game; cannot be linearised onto paper without revealing the answer.

Live network puzzle · the player toggles wires and reads the delivered power and the growing bulb update in real time. A static sheet cannot show that changing value or the connectivity feedback, which is the whole interaction. Hold pending an interactive-circuit stencil design.

Excluded from worksheets · the game is composing a program and watching it run step by step, with the crash giving feedback that drives the next edit. On paper it collapses to "pick the sequence that reaches the goal", which tests path-reading, not the plan-and-run loop the game teaches.

Rubik's Cube notation quiz. The quiz is text-based but the interactive 3D cube is the primary learning tool; a paper version loses the hands-on rotation feedback that makes it educational.

Constraint tables can be printable later; excluded until the worksheet engine has table layouts.

Excluded from worksheets · the printed form collapsed to repetitive "minimum moves = 2^n - 1" multiple-choice questions with near-identical numeric decoys, drilling the formula by rote rather than the disk-moving skill the game teaches.

Excluded from worksheets · the game is dragging a closed tour into shape and watching the live length tick down toward the optimum. On paper it collapses to "pick the shortest of these four printed routes", which tests route-reading, not the search-and-refine loop the game teaches.

Tempo and hiding previous values are the skill; paper would become ordinary arithmetic.

The game is any-of-25 → any-of-25 languages with three card directions (emoji→word, word→emoji, word→word) chosen at play time. A single printable sheet would have to freeze one language pair and one direction, so it cannot represent the game without significant loss.

Three-fact incremental reveal · the reveal pacing is core to scoring.

Hangman needs turn-by-turn wrong-letter state and a live strike counter. On paper it becomes a word-list answer reveal rather than the game, so worksheets exclude it intentionally per user request 2026-05.

The quiz shape (country + title + reign span → which leader) prints as clean multiple choice, but the leader dataset is English-only for all but two entries (names, countries, and titles fall back to English), so a printed sheet would read in English in 24 locales · it fails the worksheet-language gate. Hold until the leader data is localised.

The core challenge is simultaneous timing and reaction; static paper removes the second task.

Periodic table drill · the colour palette is part of recall, hold for now.

Anagram-pool puzzle · the entry interface is the game, not portable to paper.

Mini-game variant is "fill in the missing letter" - printable in principle, but the stencil renderer for the dashed-tile layout is still pending design.

Pure speed/tapping toy · the whole game is the timed pop-the-sheet interaction, which has no paper analogue.

The whole challenge is dragging a bow to a judged power and releasing at the right moment · a static printed sheet cannot convey the live draw, the arrow flight, or the pull-strength trade-off, so nothing solvable survives on paper.

Interactive containment puzzle · the cat reacts to each cell you block, so a printed board is either a single fixed position (trivial) or cannot represent the turn-by-turn play.

Rotate-the-rings alignment toy · the whole game is the tap-to-turn interaction and its move budget, which has no paper analogue (a static diagram would just give the answer away).

Era classification of paintings · the paintings are essential, paper version pending.

The whole challenge is watching a stone decelerate in real time and committing to a zone before it settles · a static printed sheet cannot convey the motion, the slowing, or the speed-versus-certainty trade-off, so nothing solvable survives on paper.

Colour-sequence memorisation (Simon-style). Cannot represent colour sequences and timed playback on paper without losing the entire mechanic.

Pure-suspense toy · the trap tooth is randomised and only revealed by tapping; a printed sheet would either spoil the trap or be unsolvable.

Follow-the-ball shell game · the answer depends on a live shuffle animation you must track; a printed sheet either shows the final position (no challenge) or cannot convey the motion (unsolvable).

Merged finance trainer · candlestick chart recognition, options Greeks scenarios, stock valuation, compound interest, and probability. Mixed visual + text shape; hold pending a design pass on the rendered worksheet layout.

Net folding is a 3D mental-rotation task: the player imagines a flat net wrapping into a solid, which a static paper grid cannot present without picturing the fold for them.

Direction-of-rotation puzzle read off a meshing gear diagram. The worksheet renderer cannot yet draw the interlocking gear train the question depends on. Hold pending print renderer support for gear diagrams.

"Which emoji disappeared?" depends on timed visual disappearance animation, which paper cannot reproduce. Static printed grid would simply mark the missing item and remove the memorisation challenge entirely. Excluded per user request 2026-05.

The puzzle is reading two isometric 3-D cube renderings and judging how many copies of the piece fill the block · the text worksheet renderer cannot draw the cube shapes, so a printed version would lose the mechanic.

The player aims by spinning mirrors against a live beam; excluded until the print renderer can pose a fair static reflection puzzle.

Every round turns on a scaled 2D diagram (beam cross-section, leaning stack, braced frame) that the current paper renderer cannot draw faithfully; excluded until it can.

Pure real-time reaction toy · the bars fill on a live clock and you tap to reset them before they complete, so a static printed sheet has nothing to ask.

Card-matching memory game. The face-down card → reveal → match mechanic IS the game. Static text descriptions defeat the purpose (no surprise reveal, no working-memory load). Players already see the answers in the worksheet preview.

Possible later, but current worksheet renderer does not preserve precise mirrored pixel/emoji grids.

The prompt and answers are colour swatches and food emoji whose blend is judged by sight · the text worksheet renderer cannot show the colours mixing, so a printed version would lose the visual cause-and-effect.

Pixel-art completion. Requires precise grid-cell rendering and the "see what it becomes" reveal moment.

The prompt is a drawn geometric figure (circle, hexagon, rhombus…) identified by sight. The text worksheet renderer cannot draw the shapes, so a printed sheet would have nothing for the student to name.

Distinguish very-close shades of colour. Printer reproduction and B/W photocopying lose the colour distance the puzzle hinges on; the browser version is sub-pixel-precise and has no faithful paper analogue.

The skill is remembering a path before a rotation; paper output would show both states at once and remove the memory step.

Merged pattern-recognition hub (matrix, odd-one-out, rule-induction). Matrix and rule-induction are visual-grid tasks that cannot be textified; odd-one-out could in principle be text-only but the merged surface cannot cleanly separate sub-topics for the worksheet renderer. Hold pending design pass.

Memorise digits of Pi. The single-correct-answer-string format and the in-game numpad + audio feedback are the entire learning loop; a paper "next digit?" sheet is just a digit lookup table.

Pure-luck reveal toy · the cards are hidden under foil and only uncovered by tapping; a printed sheet would either spoil every cell or be unsolvable.

Shadow projection needs a block read under a chosen light direction matched to its cast 2D shape; paper cannot render the interactive light cue that makes the puzzle fair.

The whole puzzle is recognising a colour emoji flattened to a black silhouette via filter:brightness(0). Print/PDF engines (notably iOS) do not apply that CSS filter to colour-emoji glyphs, so the printed sheet leaks the full-colour emoji and gives the answer away. Skipped until a print-safe silhouette renderer exists.

Merged spatial hub (mental rotation, net folding, shadow projection). All three sub-topics are visual spatial reasoning tasks; none can be reduced to printable text without losing the trained skill entirely.

Stroop interference (colour word vs. ink colour). The interference effect requires the word and its ink colour to differ - printing in colour is unreliable, B/W loses the test entirely.

The judgement is reading a fan of arrows at arbitrary angles and estimating their vector sum direction. The text worksheet renderer cannot draw the arrow field, so it would lose the entire mechanic.

Volume estimation compares three rendered 3D containers by length × width × height; a static paper sheet cannot convey the relative box sizes the player must read to judge which holds the most.

Pure timed-reaction toy · the moles appear and vanish on a real-time schedule, so there is nothing a printed sheet could ask a student to do.

The puzzle is reading a rendered map · the house, four places dotted around it, and following the direction arrows from cell to cell. A flat text worksheet cannot draw the grid with its positioned markers, so a printed version would lose the spatial mechanic that makes the round solvable.

Merged creator-recognition hub (art/literature/music). Art renders the actual painting on a canvas, music plays the melody on a piano · both are irreducible to paper. The literature topic is text-compatible but cannot ship separately as a worksheet sub-topic without a dedicated design pass.