Irodoku is a free-to-play indie game developed by Rainbow Bytes. It is a puzzle game that reimagines the classic logic challenge of Sudoku by replacing traditional digits with more expressive elements like colors, letters, or symbols. You must think carefully because too many mistakes will end the game.

From casual play to extreme challenge

Irodoku is a fresh twist on the classic logic puzzle. Instead of filling the grid with digits, this game lets you use colors, letters, or unique symbols to complete each row, column, and block without repetition, adding a visual and pattern-based layer to the familiar Sudoku rules.

You can choose from six difficulty levels— very easy, easy, medium, hard, expert, and master. However, mistakes are heavily penalized at higher levels, making progression slow and discouraging, as Expert and Master levels are extremely challenging and require near-perfect logic and pattern recognition.

Creative yet challenging puzzle

Irodoku, a free indie puzzle by Rainbow Bytes, reinvents Sudoku with colors, letters, and symbols, adding a visual, pattern-based challenge. With six difficulty levels, it engages players’ logic and observation skills. Expert and Master modes are extremely challenging, with heavy penalties for mistakes, making the game rewarding yet demanding for serious puzzle enthusiasts.