还丹棋（Contigo），是Frank Thibault推出的两人对战或四人对战的棋类，由3M公司在1974年出品，结合播棋类游戏与连棋类游戏。

• 6*6棋盘，棋盘周围有28个坑。
• 每方六枚棋子。
• 五十六颗玻璃扁珠，玩家共用

Contigo is a 1974 board game designed by Frank Thibault and published by 3M as part of their bookshelf game line. The game is playable by between 2 and 4 players, and is similar to both Mancala and Checkers.