Pawns move and capture one square directly ahead. There are two additional rules not found in chess. The first is promotion, which is indicated by flipping a piece over. The other rule is that you own the enemy pieces that you capture and can put them back in the game to fight for you. Instead of making a normal move, you can drop a captured piece on the board.
Pieces drop unpromoted.
Pawns, Knights, and Incense Chariots cannot be dropped toward the back of the board where they could not make any further moves. Also, you cannot drop a Pawn on a file that has another of your unpromoted Pawns on it, and you cannot drop a Pawn to give checkmate. You can play against another human, against an adjustable AI, or watch two AI's. There are several game options, including spoken comments, displaying what moves the AI is considering, and time-limited play. You can save your game to resume later and display the moves backward and forward.