It´s a Pachisi-Ludo variant where your pawn can land on a another piece and get a free ride if that other piece moves. If the double-stack lands on a piece or another piece moves on the the double-stack, then the lowest piece have to move back to that color's starting-space. A piece also has to move back to the starting-space if it moves along in another color's safety-line in the end of the road. The first player to get all four pawns in the center wins.