★ LET'S BLOOM · FREE ARCADE ★
Free Educational Games · Grades 3–12 LET'S BLOOM
40 free in-browser math, English & science games for kids. No downloads, no logins, no ads. Built and battle-tested by a Canadian non-profit charity.
☀ SUMMER SPECIAL · FREE ALL SUMMER
School's out. Chess is in.
Make it a chess summer: 2,983 guided puzzles, an 8-level bot that grows with you — Pip the Pawnling to the unbeatable Titan Prime — and live arenas where nobody sits out. Ten minutes a day, no login, free forever.
🎯 GAME MATCHMAKER
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No perfect match — these come closest.
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01 · Classic Games
Games you already know — with a twist that makes you think.
Chess, dots & boxes, tic-tac-toe, hangman, Hanoi — the games every kid should meet once. Start with chess: our biggest build yet.
- ☀️ Summer pick 🏫 Grades 3+ · 2-player, bot, academy & live
CKSTEM Chess Arena
Learn real chess — free. 2,983 guided puzzles across 47 tactical skills, an 8-level bot (Pip the Pawnling → the unbeatable Titan Prime), and live class arenas where nobody sits out. The goal isn’t just to play — it’s to learn, for free, with no login. Built for classrooms, open to everyone.
PLAY - 🏫 Grades 3+ · solo + live duels
Dots & Boxes Arena
The pencil-and-paper classic — with a secret. The player who grabs every free box usually LOSES, and the kids who figure out why become very hard to beat. Crack the 4-bot ladder solo (each bot falls to a different idea), open the Dojo’s endgame puzzle, then battle your class head-to-head in a live arena with best-of-2 duels and a climbing ladder.
PLAY - 🏫 Grades 5+ · solo + live duels
Bidding Tic-Tac-Toe
Tic-tac-toe with NO turns: every move goes to the higher SEALED BID — and the winner pays their chips to the opponent. Suddenly the kids' game is a masterclass in valuation: most moves are worth almost nothing, one move is worth everything, and finding which is which is the whole sport. Hiding underneath: a real theorem connecting bidding games to coin-flip games. Solo bot ladder + live class arena.
PLAY - Grades 3–12 · recursion · 5 levels
Flipped Tower of Hanoi
CKSTEM's flipped take on the classic. Move the bottom disk only, never place a larger disk under a smaller one. 5 levels of escalating disk counts.
PLAY
02 · Strategy Duels
Find the winning move — then beat a friend with it.
Head-to-head duels with bot ladders and live class arenas. Every one hides a real theorem, and the kids who find it become very hard to beat.
- 🏫 Grades 3+ · solo + live duels
Chomp Arena
A chocolate bar where the bottom-left square is POISON 💀. Every bite takes a square and everything above-and-right of it — and whoever eats the poison loses. Mathematicians PROVED the first player can always win, yet nobody on Earth knows the general strategy. Your class can crack the strip and the square completely… then meet the edge of human knowledge. Solo bot ladder + live class arena.
PLAY - 🏫 Grades 3+ · live duels
Nim Arena
Head-to-head Nim for the whole class. The teacher picks one of 7 floors (Subtraction, Clock, XOR, Misère, Staircase, Wythoff, or Fibonacci); students are paired off and battle classmates one-on-one, climbing a live ladder. Continuous pairing means nobody sits out. Learn winning and losing positions by playing them.
Designed by MPS 5 batch
PLAY
2025–26 session - 🏫 Grades 4+ · solo + live duels
Hex Arena
The connection game where a tie is mathematically IMPOSSIBLE — and proving that to yourself is half the fun. Place stones to link your two sides of a hexagon board before your opponent links theirs. Crack the 4-bot ladder solo, discover the Bridge in the Dojo, then battle your class in a live arena.
PLAY - 🏫 Grades 4+ · solo + live duels
Factor Chains
The numbers 1–100 are the board. Take turns claiming numbers in ONE shared chain — every claim must be a factor or multiple of the claim before it. Run out of moves and you lose. Primes are power moves, 1 is a trap, and the whole game secretly runs on a pairing theorem deep enough to power a PERFECT boss bot. Three board sizes + two opening rules. Solo bot ladder + live class arena.
PLAY - 🏫 Grades 5+ · solo + live duels
Euclid's Game
Two numbers, one rectangle. Each turn, cut away squares — subtracting a multiple of the smaller number from the larger. Reach ZERO first and you win. Hiding inside: the Euclidean algorithm, and a famous surprise — whether a position is winning is decided by the GOLDEN RATIO. Four number ranges incl. the Fibonacci marathon pairs. Solo bot ladder + live class arena.
PLAY - 🏫 Grades 5+ · solo + live duels
Sim Arena
Spin strands between the dots — but join THREE DOTS all in your own color (a triangle whose corners are dots) and your web catches YOU. The classic game of Sim, where a tie is mathematically impossible (that impossibility is a famous theorem, and your class can discover it). Crack the 4-bot ladder solo on 6- or 7-dot webs, hunt the perfect tie in the Dojo, then duel your class in a live arena.
PLAY
03 · Mind Games
Win by predicting people, not just numbers.
Secret choices, sealed bids, and big reveals — games where the right answer depends on what everyone ELSE picks.
- 🏫 Grades 5+ · whole-class + solo
Mind Reader
Everyone secretly picks a number from 0 to 100 — and the round’s QUESTION decides who wins: closest to ⅔ of the average, the most popular number, the lowest unique one, the smaller crowd… ELEVEN questions plus a mix mode, and every one needs a different kind of mind-reading, because the right answer always depends on what everyone ELSE picks. Five rounds on the projector and your class will discover something remarkable about thinking-about-thinking. Practice solo against the adaptive Robo-Class.
PLAY - 🏫 Grades 5+ · whole-class + solo
Colonel Blotto
Secretly split 100 soldiers across 5 fronts — then your plan battles EVERY classmate's plan at once. More soldiers takes a front; more fronts takes the battle. The catch: NO SAFE PLAN EXISTS. Even splits lose to concentration, concentration loses to spread-and-feint — and the round's champion plan is shown to the whole class, where it never wins twice. Solo Boot Camp + live class rooms.
PLAY - 🏫 Grades 6+ · whole-class + solo
Auction Lab
Sealed-bid auctions with play coins — and a Nobel-prize idea hiding in round one. In the Card Shop every kid gets a SECRET value for the item; highest bid wins but pays the SECOND-highest. Discover the bidding habit that is mathematically unbeatable, then meet its evil twin: the Money Pit, where the top TWO bidders both pay and smart people overpay on purpose. Solo Auction House + live class rooms.
PLAY - 🏫 Grades 6+ · whole-class + solo
Dilemma Tournament
The most famous game in game theory, played live: each round you and a partner secretly choose TEAM UP or BETRAY. Both team: +3 each. Both betray: +1. Betray a teamer: +5 against their 0. The twist that changes everything: partners stay together for a BLOCK of rounds — and they remember. Watch the room's cooperation rate collapse in one-shot mode, then climb when memory arrives. Solo Strategy Gym + live class rooms.
PLAY
04 · Core Skills
Build math muscles — arithmetic, primes, and number sense.
Play these and a curriculum skill gets stronger: mental math, order of operations, factors, primes, and divisibility.
- 🏫 Grades 1–12 · solo + live
Math Forge
Combine the four numbers with + − × ÷ and brackets to hit the target — and forge a robot part by part as you solve. 8 tiers from grades 1 to 12. Play free solo, or run a live class where students race the same puzzle on their own devices.
PLAY - Grades 2–10 · timed · 6 modes
Math Wizards Drill
60-second timed sprints. Six modes (+, −, ×, ÷, order-of-ops, mixed) × three difficulties × three durations. Personal-best tracking per mode.
PLAY - 🏫 Grades 4+ · solo · 5 levels
Prime Factory
Crack the rock, mine the primes. Every number is a chunk of glowing ore you split with prime tools — and when nothing fits, YOU make the call: prove the piece is prime and claim it 💎. Forge gems back up to a target, fill the Catalog, and feel two different routes collide into the same prime DNA. 5 levels, all open from the start. Solo, no login.
PLAY - Grades 4–10 · factors & lcm · 3 worlds
Prime Weave
A 2048-style slide puzzle for factors: two tiles fuse only when they share a prime factor, and the result is their lcm. Drag to peek which glowing threads will weave before you commit, then build the target numbers across 3 worlds.
PLAY - Grades 4–11 · solo · 6 modes
Prime Prism
A prime-factorisation detective puzzle. Every number is a circle split into coloured slices — one hue per prime — with no numbers shown. Read each circle's fingerprint and the grid's structure to deduce the hidden numbers, then name the lowest value the arrow could be. Start in the Atlas to learn the grid, then climb six modes from a small window to an unknown-step line. Solo, no login.
PLAY - Grades 4–9 · 10 levels · hints
Number Properties
Find 4 consecutive integers (1-100) that match the hint at each position. 10 levels test divisibility, primes, perfect squares, and more.
PLAY - Grades 3–12 · annual · 100 targets
Year-Game Challenge
Use the four digits of the year — exactly once each — with +, −, ×, ÷, ^, !, !!, and √ to build every number from 1 to 100. Auto-graded, progress saved.
PLAY
05 · Word Games
Spell it, guess it, build it — English play with a hidden twist.
Word games for English skills — spelling, vocabulary, and wordplay. Guess the hidden word, spin a word into another, and out-think a rival one letter at a time.
- 🏫 Grades 3+ · solo + live race
Codebreaker Lexicon
Crack a hidden 5-letter word. Guess any real word and each letter is scored — cyan = right spot, violet = right letter wrong spot, dim = not in the word — and you close in. The deduction game of Mastermind and Bulls & Cows, on the dictionary. Solo against par + live whole-class races. Underneath: information theory — the smartest guess SPLITS the still-possible words the most, not the one you hope is right.
PLAY - 🏫 Grades 4+ · solo + live duels
Ghost Trap
The schoolyard word duel. Take turns adding ONE letter to a growing fragment — keep it the start of a real word, but whoever finishes a word LOSES. Spell people into a corner. Solo bot ladder + live class arena. Hiding underneath: every fragment is a solved win-or-loss position — the exact theory that cracks Nim, now on the dictionary.
PLAY - 🏫 Grades 3+ · solo + live race
Ladder Climb
Lewis Carroll's 1879 word game. Turn one word into another by changing a single letter at a time — every rung must be a real word. Solo puzzles vs par + a live class race. The twist: the shortest ladder is a breadth-first shortest PATH through a graph of words, and the obvious "just fix the letters" move is a trap that dead-ends.
PLAY - Grades 4–12 · hangman · 100 pts
Math Hangman
Guess the hidden math term before the stick figure is fully drawn. Six categories: arithmetic, algebra, number theory, geometry, combinatorics, mathematicians.
PLAY - Grades 2–12 · seasonal · 100 pts
Xmas Hangman
Festive hangman. Guess carols, gifts, traditions, decorations, and movies before the snowman is complete. Bonus seasonal vocabulary.
PLAY
06 · Logic & Puzzles
Plan ahead, spot the pattern, crack the level.
Brain-teasers where the solve is the point — pattern spotting, tiling, and move-order planning.
- 🏫 Grades 4+ · whole-class race + solo
Pattern Race
All 81 robo-pets — every combo of body, color, eyes, and antenna. Find a TRIO: three pets where EVERY feature is all-same or all-different, and tap it before anyone else. Solo sprints, zen mode, and live whole-class races on one shared board. Behind the cuteness: the geometry of lines in four dimensions — and a problem that stumped mathematicians until 2016.
PLAY - 🏫 Grades 4+ · whole-class race + solo
Match Point
Two cards, and they ALWAYS share exactly one symbol — never zero, never two. Find it on an outer card and tap it before anyone else. Solo sprints and live whole-class races on one shared board. Behind the cuteness: a finite geometry so strange that two of its sizes are flat-out impossible — one of them only ruled out by a supercomputer in 1989.
PLAY - Grades 2–8 · 20 levels · 100 pts
House of Squares
Cover each grid perfectly using only square tiles. 20 levels — pick a tile size, drop it in, fill the whole grid. Logic + spatial reasoning.
PLAY - Grades 3–8 · order matters · L1
Grid Sums
Click tiles to fill them with the sum of their (up to 8) neighbours. Plan the order so the last tile lands on the target value.
PLAY - Grades 4–10 · order matters · L2
Compounding Sums L2
Sequel: bigger boards, harder targets. Same compounding-sum mechanic as Grid Sums, twice the depth.
PLAY
07 · Bloom Games
Designed by students in CKSTEM math problem solving classes using AI.
Built by kids, for kids — every game on this shelf was designed by students in our problem-solving classes.
- Grades 3+ · Bloom · 7 floors
Nim Tower
Climb 7 floors of math game theory, each a different Nim variant with its own bot — Random Rookie, Chronos, Greedy Glenn, Master Mira, Perfect Pixel, Tricky Tara, and the Yo-yo Yuna bonus boss. Learn XOR, the golden ratio, and Fibonacci numbers through play.
Designed by MPS 5 batch
PLAY
2025–26 session - Grades 3–5 · Bloom · 5 vaults
Crack the Safe
Join the CKSTEM Agency and crack 5 themed vaults. Arrange digits to hit a target, paint a shape to an exact perimeter, break a symbol cipher, fuse fractions, and solve a magic square — every vault is a different math puzzle.
Designed by MPS 3 batch
PLAY
2025–26 session - Grades 3–8 · Bloom · BEDMAS
Dragon Duel
Battle a dragon bot by answering BEDMAS questions. 5 levels from basic arithmetic to expert order-of-operations. Wrong answers let the dragon strike back — reduce its HP to zero to win.
Designed by MPS 3 batch
PLAY
2025–26 session - Grades 3–8 · Bloom · space race
Numberonauts
Race to Planet 100 on a cosmic snakes-and-ladders board. Answer math questions to move your rocket — wrong answers leave you stranded.
Designed by MPS 6 batch
PLAY
2025–26 session - Grades 3–8 · Bloom · arithmetic
Tower Attacker
Destroy iconic Canadian buildings by answering arithmetic questions. Wrong answers damage your power. Last tower repairs itself.
Designed by MPS 5 batch
PLAY
2025–26 session - Grades 6–8 · Bloom · escape room
Science Lab: Escape
Trapped in Professor Quark's abandoned lab! Solve science questions across 4 themed rooms — Chemistry, Physics, Biology & Space — then navigate a 3D maze to find the exit before time runs out.
Designed by MPS 6 batch
PLAY
2025–26 session - Grades 6–12 · Bloom · world race
Actively Bloom
Race around the rewilded Earth answering competition-grade math challenges. Capture 10 countries before your 5 lives run out.
Designed by MSE batch
PLAY
2025–26 session
08 · Young Scientists
Explore the world around you.
- 🏫 Grades 4+ · solo + live race
Twenty Doors
A creature hides behind twenty doors. Corner it with yes/no questions — backbone? warm-blooded? can it fly? — and each answer crosses out every creature that doesn't match. Name it in as FEW questions as possible. Solo against par, and live whole-class races. Behind the fun: a real classification key, and the reason no strategy on Earth can beat a certain number of questions.
PLAY - Grades 3–6 · 3 activities
Young Scientist Fun Time
Three drag-and-drop science activities: place chess pieces in starting position, order the planets by distance from the Sun, and put space-photography milestones on the timeline.
PLAY
