Zebra
Read a clue. Cross off what it rules out. One arrangement survives.
Read a clue. Cross off what it rules out. Three proved cases a day, each with exactly one solution and never a guess.
What makes a Zebra case fair
Proved solvable, graded by technique, and readable in your own language
Three cases every day
Warm-Up, then Cadet, then Inspector — the same three worldwide. The day counts toward your streak only when all three are closed.
Exactly one solution, proved
The generator builds the answer first, then proves the clues allow only that one arrangement. No case ever asks you to guess.
Tiers named after the technique
Cross off, chain through a third column, work out before-and-after, or test a possibility. The solver measures the depth; the label reports it.
Free play and a full archive
Endless cases at any of the four tiers, all open from the first launch, and the Archive replays any past date's three cases from its seed.
Five languages, clues included
The clue sentences themselves are translated, not just the menus. Right-to-left layout, native numerals, and marks that are shapes before colours.
Offline, and calm about money
No account, no sign-up. A hint names the next step, never the answer; rewarded video is opt-in; no banners on the board; one €1.99 unlock removes ads.
See it in play
The same puzzle in five languages, including full right-to-left for Arabic, Persian and Kurdish.
Ready to try Zebra?
Read a clue. Cross off what it rules out. One arrangement survives.
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