Chess Sudoku

Is this chess or sudoku? Well, it's both!

Your goal is to fill up the gaps on the chessboard with the missing chess pieces. The number on each square represents how many pieces must attack it.

Try this awesome app and train your brain cells with an almost infinite amount of challenges!

+ short-term amusement for your 5 min break or long-term challenging brain game
+ 100 pre-built challenges
+ nearly an infinite number of challenges in the custom mode
+ it's up to you: you choose the board size, the number of missing chess pieces, ... etc.
+ have the squares automatically update their attacks with each piece put on the board
+ even played by experienced chess players
+ no chess knowledge required as long as you know how the pieces move (there are some instructions too!)
+ completely free!
+ no ads!
+ no strange app permissions!
+ the app does not save any user data about you

Known Bugs:
- for devices with Android 2.3 (Gingerbread): The black border around the chessboard varies in thickness and the board can be moved a tiny bit
- for devices with a very small screen: the attack counter on a square can be very tiny although there is enough space for it to be bigger
- the attack counter on a square may not be centered