Bonus game pieces:To unlock a bonus set of game pieces for Chess, Checkers, Reversi, and Mancala, complete an achievement.Achievements:ACHIEVEMENT – HOW TO UNLOCKPlay 5 (5 points) – Play 5 online games.AI? Yeah, Right! (20 points) – Beat the AI at all four games.Game Swap (5 points) – Playing online, play at least one game of all four game types in the same session.Chess Champ (25 points) – Win 10 online Chess games.Five Kings (10 points) – Play Checkers and in any game get five Kings.Mancala Master (20 points) – Win a game of Mancala with 27 pieces or more.King Me! (10 points) – Get a king in Checkers.Mancala Warrior (20 points) – Play online with a friend and win 2 Mancala games as white and 2 as black.Four Corners (30 points) – Capture all four corners in any game of Reversi.Winner Of Games (30 points) – Win a ranked match in each game type.Overkill (20 points) – Win at Chess while taking every one of your opponent