SolLune is played on a 4x4 board by two players, representing Sun and Moon. Each player has a supply of square pieces depicting a silver symbol on one side and a gold one on the other. Sun begins by placing a piece on the empty board. Thereafter, each player moves a piece of his opponent to an orthogonally adjacent space, flipping it to the opposite color before placing a piece of his own.
 
Win by getting three of your pieces in an orthogonal or diagonal row, all silver or all gold, and not adjacent to any vacant space.
 
In the diagram below, it's Sun's turn. He can flip the Moon in the upper-right corner (turning it gold) and then place one of his pieces, either side up, into the marked square to win.
 
Variants are included to play on a 6x6 board.

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