ClueGrid: Logic Puzzles

Every case is a locked room of pure logic. Read the clues, mark what must be true, eliminate what cannot be, and close the file.

ClueGrid is a grid-deduction puzzle game — the classic "Einstein puzzle", rebuilt as a noir detective's casebook. No timers pushing you, no lives to lose, no internet needed. Just you and the evidence.

HOW IT WORKS
Each case gives you a set of suspects and a handful of clues. Tap a cell once to rule a pairing out, twice to lock it in. Every clue you use narrows the grid until only one arrangement survives. Every puzzle has exactly one solution, and it is always reachable by reasoning alone — never by guessing.

WHAT YOU GET
• Endless cases — generated on your device, so the archive never runs out
• Difficulty that grows with you: 3x3 grids to demanding 5x5 boards
• Four kinds of clues — direct statements, denials, neighbour hints, and either-or dilemmas
• Shadow Files: every tenth case hides all direct clues. Nobody tells you anything straight.
• Three settings — a neighbourhood, a busy kitchen, a bus full of travellers
• Star ratings: solve a case with no checks and no wrong marks to earn all three
• Daily cases, a solving streak, detective ranks and badges to unlock
• Case archive with generated titles — every file has a name and a number

BUILT TO BE FAIR
Every puzzle is verified to have a single solution before it reaches you. The hint system explains its reasoning instead of just revealing an answer — it tells you which clue forces the next step, so you learn the technique rather than skipping it.

PLAYS ANYWHERE
Fully offline. Puzzles are generated on your phone, not downloaded, so ClueGrid works on a plane, on the underground, or with mobile data switched off. Your progress stays on your device — no account, no sign-up, no cloud.

Free, supported by ads. Rewarded ads are always optional: every case can be solved without watching a single one, and no ad ever appears while you are solving.

Recent changes:
Tutorial rebuilt: every step now explains why each mark goes where it does, including the bottom pet–house grid. You can skip it on first launch and replay it anytime from the ? button on the Cases screen.