William Daniel 'Dan' Troyka is an American game inventor whose most famous game is Breakthrough (2000). It won the 2001 8x8 Game Design Competition sponsored by Abstract Games Magazine, About Board Games and the Strategy Gaming Society. Troyka created more than 30 board games and invented the Cross-Mancala meta-game, which includes three mancala variants: Cross-Wari (2001), Cross-Kalah (2001) and Cross-Endodoi (2002). He lives with his wife and two young children in Wildwood subdivision. His hobbies are photography and travelling.