Unknowns: Math Logic Puzzle

Unknowns is a calm, clever math logic puzzle that blends sudoku-style deduction with algebra. Each row is a variable, each column is a number — work out which value belongs to each letter so that every equation is true.

No timers. No lives. No guessing. Just you, a grid, and a chain of reasoning that leads to exactly one answer.

HOW IT WORKS
• Each variable takes a unique whole number from 1 to N
• Tap a cell once to rule a value out with ✕, twice to lock it in with ✓
• Locking a value automatically clears the rest of that row and column
• Equations turn green when satisfied and red when broken
• Adjacent letters multiply — AB means A × B

Every puzzle has exactly one solution, and every solution is reachable by pure deduction. If you find yourself guessing, there is always a clue you have not used yet.

STORY MODE
240 handcrafted levels across 20 chapters, ramping gently from four-variable warm-ups to grids that will keep you thinking for a while. Progress saves automatically, so you can put a puzzle down halfway and pick it up on the bus.

CUSTOM PUZZLES
Free-play mode builds fresh grids from 4×4 up to 9×9 whenever you want a new challenge. Unlimited puzzles, no waiting, no energy meter.

LEARN AS YOU PLAY
New to logic puzzles? An interactive tutorial walks you through your first solve step by step. Basic and advanced strategy guides stay available in Settings, including the elimination techniques that make the larger grids manageable.

IF YOU ENJOY THESE, YOU WILL ENJOY THIS
Sudoku, kakuro, logic grid puzzles, nonograms, cross sums, brain teasers, mental math drills, number games, riddles and IQ tests. Unknowns sits somewhere between sudoku and the algebra homework you would actually choose to do.

FEATURES
• 240 handcrafted levels, each with a single unique solution
• Unlimited generated puzzles from 4×4 to 9×9
• Interactive tutorial plus basic and advanced strategy guides
• Optional hints when you want a nudge, never forced on you
• Undo any move and restart any puzzle
• Works on phones and tablets
• Portrait and landscape support
• Fully offline — no account, no sign-up, no internet connection needed
• Low-glare board designed for long sessions

GOOD FOR
Winding down at the end of the day. Commutes, queues and waiting rooms. Keeping your reasoning sharp. Anyone who likes the moment a puzzle clicks and the whole grid resolves at once.

Free to play with ads. One optional purchase removes all ads permanently — no subscription, no recurring charges.