Playable Puzzles

Polyglot

Collect the same meaning from four languages

Sixteen words: four meanings × four languages. Gather each meaning by picking its word from every language. One language is always English and the other three share a family, so cognates of the English word (one / un / uno…) are your trail. Solving reveals meanings, languages and IPA. 200 stages (20 × 10 sets).

Tridem

Three slide as one — a weekly arc

A daily sliding puzzle whose rule changes by weekday. Slide three pieces onto their goals. New every day; the full archive is free to browse. The engine itself verifies the unique solution.

CRYPTEM

Reel cipher — a daily cipher lock

Rotate the reels until all five columns decode to their target digits. A logic lock whose cipher table is fully deducible from the opening position. Updated daily; the full archive is free to play.

Math?

The symbols lie — a daily rule-deduction number puzzle

What the five symbols do to a number reshuffles every day. Deduce today's rules from nothing but the results of your placements, across three boards. Stage 1 forces every symbol once — yet never pins the rules down; the back half is engineered to betray your first theory. Updated daily; the full archive is free.

Sanpo

Trace one-stroke paths that solve the equations

Trace one-stroke paths (diagonals OK) through a digit grid to fill blank equations like □＋□×□＝12. Every equation shares the same answer; use up every cell to clear. Ten uniqueness-verified puzzles refresh every Sunday.

Tetro 15

Number tetrominoes where every row and column sums to 15

Tile the board with number-carrying tetrominoes so that every row and column sums to 15. Numbers may repeat and no 1–9-per-box rule applies. Sizes grow from 4×4 to 6×6 and 8×8, with 50 fresh puzzles every month.

Tetris for Masochists

Tetris with only S and Z pieces

Ordinary real-time Tetris — except the only pieces that ever fall are the two most awkward ones, S and Z. Rotate and place them to clear lines and survive as long as you can. A browser-only experiment.

Cointossweeper

Minesweeper that only deals 50:50s

Real Minesweeper is always solvable by logic; this one only ever serves the unsolvable 50:50. Guess which of two covered cells is the mine and chase the longest streak.

16-Clue Sudoku

The Sudoku with no unique solution

Only 16 clues. A uniquely-solvable Sudoku needs at least 17, so this one always has multiple solutions; any rule-valid filling of all 81 cells counts as a clear.

Gomoku: First Player Always Wins

You play second, and always lose

Free-style Gomoku is a proven first-player win (Allis, 1994). You go second against a first-moving CPU and cannot win in principle — feel the theorem by losing.

Gacha Simulator

Monte-Carlo the pulls and cost to complete your targets, from rates and pity.