Shirodoko - the next Sudoku!

Shirodoko™ is a contender for the next Sudoku! This logic puzzle game is known by other names such as Kuromasu, Kurodoko, or "Where is Black Cells". Free to download with ads, and only one optional IAP to buy, ever! Even without the IAP you get near-infinite puzzles to play. The lone IAP removes ads and adds more variety to your puzzles by allowing for more board sizes. 9x9, 6x12 and 10x18 sizes are included. With purchase any size from 5x5 to 20x30 is possible. "Translated" in over 30 languages.