Zoodoku: Animal Logic Puzzle

One board. One solution. Nothing left to chance.

Zoodoku is a logic puzzle you solve by elimination, not by luck. Every board is split into colored territories, and exactly one animal belongs in each. Animals never share a row or a column, and they never touch - not even at a corner. Three rules, four hundred boards, and exactly one correct answer on every single one of them.

THE CLIMB
Boards start at a gentle 5×5 and grow to a full 9×9. Easy and Medium fall to forced moves and careful crossing out. Hard makes you chain several deductions together before a single cell gives way. And then there are the fifteen Expert boards, where pure deduction runs out of road: finishing one means committing to a placement and proving it right. Clear a level inside par with every heart intact and you take all three stars - the hard part is never solving it, it is solving it cleanly.

HOW IT PLAYS
Tap a cell to place an animal. Tap again to leave a cross - crosses are your notes, and Auto-cross will mark the eliminated cells for you. Every puzzle starts with three hearts; a wrong animal costs one, and the hearts you finish with become your stars. Stuck? A hint does not just reveal a square, it tells you why: "Only cell left in this row."

WHAT IS INSIDE
• 400 levels across 10 habitats - Savanna, Jungle, Arctic, Wetlands, Rainforest, Grasslands, Canopy, Bamboo, Floodplain and the Tiger Den
• Boards from a gentle 5×5 up to a full 9×9, eighty of each size
• Four difficulty bands - Easy, Medium, Hard and fifteen Expert boards for the stubborn
• A new Daily puzzle every day, built from the date itself, with the board size rotating through the week
• Daily streaks, a calendar of the stars you have earned, and a home-screen widget for today's puzzle
• Stats worth reading: solves by size, solves by difficulty, best times, total play time
• Undo, self-explaining hints, and progress that saves itself when you step away
• Habitat ambience and soft sound effects, each with its own switch
• Share a clear - with a spoiler-safe option that hides the animals
• A Trophy Room with 36 trophies, and a Zoo Album that collects every animal you meet on a winning board
• Streak Shields keep a daily streak alive across one missed day; share a spoiler-free Daily result or compare times with friends

MADE TO BE COMFORTABLE
Colorblind mode swaps in higher-contrast territory colors and gives every region its own pattern, so the board never depends on hue alone. Reduce motion turns off the non-essential animation. Every cell is announced to TalkBack with its row, column, territory and mark. Pick light, dark, follow-the-system or Material You on Android 12+ - the board's own colors stay exactly where they are. And on Android 13+ you can set Zoodoku's language independently of your phone's, from nineteen.

PLAY ANYWHERE
All 400 levels are inside the app and the Daily is generated on your device, so a flight, a tunnel or a dead zone changes nothing. No account. No sign-in.

ADS AND PURCHASES
A full-screen ad can appear on the win screen after a run of campaign wins - never during a puzzle and never after the Daily. Optional one-time purchases in the Zoo Shop can remove those win-screen ads, let you play levels in any order, open every endless lane and past Daily right away, or add hints and Streak Shields. Watching an ad for an extra heart or an extra hint is always your choice, never a requirement. Progress, settings and stats are kept on your device, and your privacy choices can be reviewed any time from Settings.

Animal habitats, quiet logic. Four hundred solutions are waiting - go take them.