The player who cannot move his/her chameleon anymore loses.

You play as White against Black.
First both players click the board anywhere to drop their chameleon (a chess piece; a Queen in the default variant), then they alternate moving their piece.
The moving piece will leave a copy of itself on its from-position, and will turn into a different chess piece on its to-position. Each move (for Queen, Rook and Bishop) must be as far as possible, over empty positions and ending on an empty position.
King and Knight move only one step.

You lose if your piece is stalemated.

In the default version you drop a Queen, which then turns into a Knight, then back into a Queen and so on. We call this piece a QN-chameleon. Some variants use other sequences.

The default variant plays on the 5x5 board. Some variants use other board sizes.

If you play against the computer, the Zillions machine is virtually unbeatable.