Library · 177 modules online
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Expected ValueEstimate the probability-weighted payoff of a bet · weigh upside, downside, jackpots and the rare risk of ruinLiveJun 2026Paper FoldsA sheet of paper is 0.1 mm thick and every fold doubles it · guess how many folds reach a giraffe, Everest or the MoonLiveJun 2026Perfect DaySplit your ideal 24 hours across sleep, work, study, fun, family and me-time · then compare it to country averagesLiveJun 2026Which CurveTwo graphs over time · pick which curve is the real shape of a phenomenon, from world population to a year of rainfallLiveJun 2026Random Life HackTap for one random source-verified life hack at a time · a quick, useful tip drawn from every categoryLiveJun 2026Pet Care HacksSource-verified pet-care tips from the AVMA, ASPCA and AAHALiveJun 2026Grooming HacksSource-verified grooming and self-care tips from the AAD, ADA and Mayo ClinicLiveJun 2026Privacy HacksSource-verified digital-privacy and security steps from CISA, the FTC and the EFFLiveJun 2026Safety HacksSource-verified home-safety and emergency-prep tips from Ready.gov, the NFPA and the Red CrossLiveJun 2026Gardening HacksSource-verified gardening tips from university cooperative extension servicesLiveJun 2026
By age:
Memory
Pi
Memorize pi, e, and 38 mathematical constants using the numpad path method
Memory Game
Match emoji cards with their word labels across 10 categories
Color
Watch the color sequence light up, then repeat it. Train your visual memory with up to 12 colors
Music Lab
Train your ear on a piano · random tone sequences for pitch memory, or learn a famous public-domain melody three notes at a time
Ghost
Memorize a grid of emojis, then spot the missing one. How many rounds can you survive?
Tone Memory
Hear a sequence of piano notes, then play it back from memory. Pure pitch-and-order recall that grows as you climb
Knowledge
Geography
Learn world capitals, flags, and geography through interactive map quizzes
Facts
Spot the one true statement. Math, calendar, and geography facts generated on the fly
Ordering
Put items in order · historical events by date, planets and animals by size, or rank by an objective value. Pick the topic mix
Periodic Table
Master the periodic table of elements. Identify elements by symbol, atomic number, and properties
Heads of State
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
Which Curve
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
Who Made This?
Recognize famous artworks, literary excerpts, and musical compositions by their creators. Three cultural disciplines, one streak
Name the Shape
A shape appears · circle, hexagon, rhombus, trapezoid · and you pick its name. Geometry vocabulary, one tap at a time
Mixing
Mix two things and pick what you get · red and blue make purple, grapes become wine. Colours and kitchen transformations
Useful Facts
Fill the missing word in a practical, true fact · learn something you can actually use, one cloze at a time
Fun Facts
Fill the missing word in a quirky, surprising fact · bite-size trivia with a twist
But Why?
Fill the blank in a short how-it-works explanation · understand the everyday mechanisms behind familiar things
Who Painted It?
See a famous painting and name the artist who made it. Visual art recognition across movements and centuries
Who Wrote It?
Read a famous literary excerpt and identify its author. Recognise voices across the canon
Words
Flashcards
Study vocabulary between any two of 25 languages · learn by emoji to word, word to emoji, or word to word
Riddles
Solve classic, logic, math, and wordplay riddles. Pick difficulty, type, and how many choices. Streak mode
Wordle
Guess the secret word in 6 attempts · green for correct, yellow for wrong spot, grey for absent. Three difficulty tiers
Hangman
Guess the word one letter at a time before the stickman is drawn. Easy 4-letter, medium 5-letter, hard 6+ letter pools
Word Square
Form words using only the letters in the grid. Every grid contains at least one pangram. Anagram pool puzzle, not a word search
Crossword
Intersecting word puzzles · direct definitions on Easy, synonyms on Medium, cryptic clues on Hard
Fast Typing
Real-time WPM and accuracy on a 200+ poem-excerpt library. Single words, sentences, or whole stanzas. Physical and mobile keyboards
Feeling Circle
Explore Plutchik's Wheel of Emotions. Match complex emotions to their component feelings or identify the more intense form
Word Games
Wordle, Hangman, and Word Square in one place · guess the hidden word, save the stickman, or build words from a letter grid
Numbers
Sudoku Force
Spot the cell where only one digit fits. Forced-move Sudoku micro-puzzles, validated by row, column, and box
Perfect Day
Split your ideal 24 hours across sleep, work, study, fun, family and me-time · then compare it to country averages
Paper Folds
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
Multi-Tasker
Solve quick math while catching timed bell events without dropping the rhythm
Card Count
Keep a running tally of positive and negative values flashed at speed
Prime Time
Decide fast: prime numbers one way, composites the other
Fractions Faster
Tap the fraction that represents the largest real value
Estimation
Test your number sense across three lenses: wild comparisons, product estimation, and volume guessing. All in one streak
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
Finance Lab
Train candlestick patterns, options Greeks, stock valuation, compound interest, and probability in one place. Pick which topics to drill
Market Health
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
Expected Value
Estimate the probability-weighted payoff of a bet · weigh upside, downside, jackpots and the rare risk of ruin
Reasoning
Flag a Mine
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
Hash
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
Inference
A handful is drawn from one hidden bag · reason backward to its most likely source
Whodunit
Clues are found at the scene · pick the one suspect whose marks explain every clue
Load Bearer
Predict which structure carries the load · bridges, towers, cranes and dams, every answer decided by exact physics
Deduction
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
Power Grid
Switch wires on and off to send exactly the right power through the network and grow the bulb to full
Gear Train
Given the rotation of the first gear, work out which way the last gear in the chain turns
Coast
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
Chess Mate
Pick the move that delivers checkmate in one. Pure board reasoning, cheat-proof validation, streak mode
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
Catch the Cat
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
Tower of Hanoi
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
Logic Puzzles
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
Akari
Place bulbs to light every cell · no two bulbs see each other and numbered walls count their neighbours. A classic light-up logic puzzle
Shikaku
Divide the grid into rectangles · each one holds a single number equal to its area. A clean area-partition logic puzzle
Slitherlink
Draw one closed loop · each number says how many of its four edges the loop uses. A pure edge-deduction puzzle
Bridges
Connect the islands with bridges · each island takes exactly its number, none crossing, all joined into one network
Infinity Loop
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
Rule Induction
Guess the hidden rule behind a stream of examples, then apply it to the next one. Inductive reasoning under uncertainty
Mirror Draw
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
Spatial
Rubik's Cube
Learn the layer-by-layer method with an interactive 3D cube and a notation drill
Pathfinder
Memorize a path on a grid, rotate the board, then recreate the transformed route
Laser Bounce
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
Vector Arrows
Several arrows fan out from one point · add them tip to tail and judge which way the combined arrow points
How Many Fit?
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
Stroop
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
Mosaic
A famous painting paints itself row by row from coloured-emoji squares. Guess the work before the scanline finishes
Nuance
Spot the camouflaged digit or letter as it fades into the background. An Ishihara-style plate as a streak game
Silhouette
See a black silhouette · pick what it is. 100 famous animals, foods, vehicles and places. Outline-recognition in 25 languages
Where's MemPi
Find MemPi the mascot hiding in a wall of coral, red and pink emojis. The higher the difficulty, the more the decoys blend in
Cups
Watch which cup hides the ball, follow it through a quick shuffle, then tap the right one. More cups and swaps as difficulty climbs
Whack-a-Mole
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
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
Bubble Wrap
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 Card
Scratch off a grid of foil cells. Uncover enough of the prize symbol before you reveal too many blanks · quick nerve-and-luck game
Polymath
Labyrinth
Walk a fog-of-war maze and beat short encounters drawn from every other game. The polymath gauntlet · difficulty ramps every level
Polymath
Cross-game streak roulette drawn from the whole PlayMemorize catalogue. Pure full-spectrum test · every round can be any game
Math Polymath
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
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
Dice Roller
Roll 1 to 100 dice at once. Big visual grid, running total and average, instant re-roll. Handy for board games, RPGs, and probability
Random Facts
Tap for a random fact · practical and fun, from boiling points to wombat trivia. Roll another or copy it. Works offline
Travel Life Hacks
Source-verified travel and packing hacks · pack smaller, clear security faster and arrive ready, per airlines, the TSA and travel experts
Cleaning Hacks
Source-verified cleaning hacks · clean faster and safer the way the EPA, CDC and appliance makers recommend
Money Hacks
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
Sleep Hacks
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
Laundry Hacks
Source-verified laundry and garment-care tips from the American Cleaning Institute, the DOE and makers
Study Hacks
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
Social Hacks
Research-backed social and conversation tips from peer-reviewed psychology and UC Berkeley
Cooking Hacks
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
Safety Hacks
Source-verified home-safety and emergency-prep tips from Ready.gov, the NFPA and the Red Cross
Privacy Hacks
Source-verified digital-privacy and security steps from CISA, the FTC and the EFF
Grooming Hacks
Source-verified grooming and self-care tips from the AAD, ADA and Mayo Clinic
Pet Care Hacks
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
Black BoxDeduce the hidden rule by probing fixed inputs. Watch what comes out of the box to crack the logicBetaContinuumCold, cool, warm, hot · tap the words in order along their intensity gradient, weakest to strongestBetaTransitionsTwo sentences, one blank · pick the connector (however, therefore, meanwhile) that bridges them logicallyBetaConnotationIs the word's tone positive or negative? Judge the feeling a word carries, not its dictionary meaningBetaSpeed SortOne item, two bins · tap the category each thing belongs to before the rule shifts under youBetaRule FlipOne card, two rules · top half asks about the letter, bottom half asks about the number. Apply the right oneBetaSignal SwitchA green leaf asks where it points · an orange leaf asks where it drifts. Read the colour, switch the ruleBetaFlankerA row of arrows crowds the screen · report where the middle one points and ignore the flock around itBetaRank by...Score life activities by purpose, fun, or horror · then compare the three lenses side by side and revisit your own answersBetaDomino ForcePick the domino that fits the gap. Pure logic deduction based on matching adjacent numbers in a chainBetaLogical FallaciesSpot the flaw in reasoning or match a famous fallacy to its definitionBetaPower TowersWhich power tower is larger? Compare exponential stacks using logarithmic logic and number senseBetaAI SlopIs it a famous quote, a classic proverb, or just AI-generated slop? Test your intuition against the machinesBetaTimelineDrag real historical events onto a year-axis · never wrong for a far-off guess, and the exact years are revealed when you finishBetaInflationA loaf of bread cost 12 cents in 1950 · guess what real old prices are worth in today's money, from the actual CPIBetaPerfect ShapeDraw a circle, square, triangle, pentagon or hexagon freehand in one stroke · we score how close to perfect you gotBetaProgressLive bars for how far through the year, month, week, day and hour you are · switch time zones, and keep a saved to-do listBetaHuman MapA live world map that pulses green for every birth and red for every death · driven purely by real population and birth/death-rate mathsBetaHuman TimerA beat-the-clock CAPTCHA speedrun · read distorted codes, pick the right tiles, spot the tilt and tap in order. Race your own personal bestBetaKitchen Life HacksSource-verified kitchen and food hacks · store, ripen, season and cook the way food science and food-safety authorities recommendBetaLife HacksA growing library of genuinely useful life hacks · each one checked against a cited, reputable source and shown as a clear visual cardBetaBattle MateProgram each unit's 8 orders, then execute · all units resolve at once over 8 ticks. Flank, charge and shoot to break the enemy lineBetaSports BlanksA sports fact or rule appears with one word missing · a number, team, or record. Pick the right word and build a streakBetaMovie BlanksA fact about a famous film appears with one word missing · a character, year, or title word. Pick the right word and build a streakBetaQuote BlanksA famous quote or saying appears with one word missing. Pick the right word to complete it and build a streakBetaGeography BlanksA world-geography fact appears with one word missing · a capital, river, or country. Pick the right word and build a streakBetaScience BlanksA science or nature fact appears with one word missing · a number, name, or process. Pick the right word and build a streakBetaHistory BlanksA sentence about a historical event appears with one word missing · a year, place, or name. Pick the right word and build a streakBetaRecipe BlanksA recipe step appears with one word missing · an amount, temperature, or technique. Pick the right word and build a streakBetaWho Composed It?Hear a famous piece of music and name its composer. Classical and public-domain ear trainingBetaMelody LabLearn a famous public-domain melody three notes at a time · listen, repeat, and extend until you can play the whole tuneBetaOdd One OutSeveral items, one rule · find the single one that does not belong. Quick abstract-reasoning roundsBetaNurikabeCarve numbered islands from a sea of walls · the sea is one connected pool with no 2×2 block. A classic island logic puzzleBetaLoadingA loading bar fills up · tap to reset it before it finishes. Each bar you reach starts faster · endless, no levels · how many can you reachBetaOld CursesGuess what an archaic curse or insult once meant, then learn its history · a word that scandalised long ago and offends no one nowBetaBullseyeDraw the bow by dragging back, then release to loose the arrow · land it in the gold. Too soft falls short, overdraw sails pastBetaShadow CastA block stands under a light · read the light's direction and pick the flat shadow it casts. Spatial projection, no reading neededBetaFold OutA flat net sits on the card · pick the 3D solid it folds up into. Cube, pyramid or prism, decided by pure visual-spatial reasoningBetaVolume EstimateThree boxes, three sizes · judge each one by length, width and height and pick the one that holds the most. Pure volume sense, no readingBetaMeasure ItReal objects, real numbers · calculate the circumference, area, volume and radius of pizzas, doors and footballsBetaDecay TimeHow long until it is gone? Guess how long everyday things take to decompose · from banana peels to glass bottlesBetaDid You Know?Spot the true statement or fill the missing word · facts, fun trivia, and how-it-works explanations. Four modes, one streakBetaTrig Drillssin, cos, tan - pick the right value for any reference angle. Drills from 0° to 360° across all four quadrantsBetaHeavy FrictionRun a factory line · slide to produce, hire workers and admins to automate, ship to the warehouse and sell, then expand. A tactile idle gameBetaHistory QuizThree modes on one historical pool: pick the year an event happened, who was responsible, or which deed belongs to a given personBetaMath LabA lab of timed number drills · arithmetic, trigonometry, prime spotting and fraction sizing, each on its own tabBetaRed Day MatchMatch public holidays to their date, religion, or country. Filter by Christian, Muslim, Jewish, Hindu, or SecularBetaWhich Philosophy?A famous philosophical statement appears · pick the philosophy or movement it represents. Filter by category (ethics, epistemology, mind…)BetaProverbsA classic saying appears with one word missing · pick the word that completes it · quick multiple-choice rounds in your languageBetaName RarityLook 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 climbBetaBackwardsRead words in reverse. See DOG, pick GOD from the list. Millisecond timer, 25 languagesBetaDefineWhat does this word mean? Pick the correct meaning from the options. Vocabulary in all 25 languagesBetaAnalogiesDoctor is to hospital as teacher is to ___ ? Train verbal reasoning through word-pair relationshipsBetaSequencesWhat comes next? Spot the pattern in number sequences - arithmetic, geometric, Fibonacci, and moreBeta
