bionoid is a free Android puzzle game developed by Verschueren Geert. It offers endless fun with different board sizes and difficulties, just like the binary puzzles you find in your daily newspaper or online puzzle websites. The objective of the game is to place the binary values 0 and 1 in the empty fields of the grid while following specific rules. The values cannot appear more than twice next to each other, and each row and column must have an equal amount of 0's and 1's while being unique and not repeated.

The game provides a user-friendly interface with the ability to lock cells using long press, toggle error highlighting by clicking on the exclamation mark, and store the current board state using the disk icon. The arrows next to the disk icon can be used to move between the stored board states, and the current board state is automatically saved when switching apps. Additionally, users can backup their user code and access the code screen again by long clicking the logo in the main menu and using the send button.