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Chaupat
The Indian game of Chaupat and the closely-related game Pachisi are the original cross-and-circle games, of which the best known example in the West is the much-simplified Ludo. Players aim to race their pieces around the board, with moves determined by a throw of cowry shells. An opponent’s pieces can be captured by landing on the same square, and two of a player’s pieces on the same square can merge into a “super-piece”.
The Mogul Emperor Akbar I played the game on a giant board, using slave-girls instead of pieces. How two of these “pieces” merged into a “super-piece” is unclear—and a Google search for “slave girl pieces” returns results about, shall we say, other things.