Kerodoku: Brain Puzzle Games

Queens-style frog logic puzzle

Free · Designed for iPad. Not verified for macOS.

One frog per row, column and color — and no two frogs may touch. Hundreds of verified single-solution puzzles, a fresh daily challenge, no timer. Pure logic, no guessing. Kerodoku is a pure logic puzzle that blends the deduction of Sudoku with the elimination of Minesweeper — with frogs. Every board is split into colored regions. Your job: place exactly one frog in every row, every column and every color region, and never let two frogs touch — not even diagonally. Tap to mark an X, tap again to place a frog, swipe to clear a whole run of cells. Three lives per board; when a frog lands wrong, you see exactly which rule it broke, so every mistake teaches you something. HOW IT PLAYS • One frog per row, per column, per color region • No two frogs adjacent — horizontally, vertically or diagonally • Every puzzle has exactly one solution and is solvable by logic alone. No guessing required, ever • Boards grow from a gentle 6×6 to brain-bending 10×10 WHY PLAYERS STAY • Hand-checked puzzles with a smooth difficulty curve — you learn a new technique every few stages • Daily challenge: one fresh board a day, race your own best time • Streaks and a daily challenge that keep your practice going • Hints and scans when you're stuck — use them or earn bragging rights without them • Short sessions, no timer on regular stages • Calm pastel look, satisfying haptics, no forced tutorials past the first minute If you enjoy Sudoku, Queens, Star Battle, Nonogram, Minesweeper or any "one per row and column" riddle, Kerodoku will feel instantly familiar — and then surprise you with how deep it goes. Kerodoku (개굴도쿠) is made by Fervorlab. Play it on the web at kerodoku.fervorlab.com.

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• iPad support with a tablet-optimized layout • Rewarded ads now grant their rewards more reliably • Haptics, ads and general stability improvements

Version 1.0.5

The developer, Wontae Hwang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers
    • Usage Data
    • Diagnostics

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Wontae Hwang
Size
  • 25.2 MB
Category
  • Puzzle
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
Copyright
  • © 2026 Fervorlab
  • Developer Website
  • Privacy Policy

    • More by Wontae Hwang