Chess!! - professional, luxury design chess game that you can play with your friends or against challenging computer opponent. Features: * Exclusive user interface and great sound effects * Single player and two players game - play with your friends or against artificial intelligence engine * 9 levels of difficulty * Move undo function that allows you multiple retries and workout of your game standing * Advanced moves like promotion, castling, en passant are included and not forgotten The game uses modified version of exclusive Amy Chess Engine originally developed by Thorsten Greiner. FAQ: How to do castling? - Tap king then tap castling move (it is 2 squares long).