MadXXO is based on Tic-Tac-Toe (also known as Xs and Os, or noughts and crosses). However, unlike the over 3000 years old predecessor, in MadXXO one does not place Os and Xs until the whole board is filled. There can only be exactly three Xs and three Os placed. The Xs and Os then have to be moved around to place three marks in a row or diagonally to win the game. As a result, a previously occupied position on the board is cleared with each move, giving new ways of making a favorable move. Exactly this game dynamics provides plenty of fun and thrills.