Subiku is a free number puzzle game available on the Android platform, developed by pierrox. It follows the same logic as Sudoku, Takuzu, Picross, or 2048, but with a unique twist. The game is faster than Sudoku, and the grid can be completed in less than five minutes.

The game consists of a grid of 8x8 squares, with only 1s and 0s, and must be completed according to three simple rules. Firstly, there must be an equal number of 0s and 1s in each row and column. Secondly, no more than two similar numbers can be next to or below each other. Lastly, no more than two rows or columns can be the same.

Subiku offers five difficulty levels and six grid sizes, ranging from 4x4 to 14x14. The game boasts over 5000 grids, which can be played without any additional purchases. Additionally, the game offers clues, displays solutions, has a zoom option for smaller screens, and has an auto-save feature. The real-time error indication and draft mode make solving the toughest grids an enjoyable experience.

Overall, Subiku is an addictive puzzle game that offers a unique twist on the classic Sudoku. Its simple rules and various difficulty levels make it suitable for players of all skill levels.