HamamDoku is on the App Store
Forget sudoku. One roach per row, per column and per colour, and they never touch.
HamamDoku went live on the App Store on 30 September, free.
You used to run from roaches. Now you place them: one in every row, one in every column, one in every colour, and never two touching — not even at the corners. A run grows from 5×5 to 10×10 on three hearts, how far you get is your score, and a new leaderboard season opens every Monday. Every board is solved before you see it, so there is never a guess.