The "game board" is set up in the box - four poles are put in the corners which have plateaus on them. Each player gets a catapult (seesaw-style), four actual fluffy pillows and three cardboard figurines of their color.
The active player puts a pillow on his/her catapult and tries to lob it into the box. If successful, he/she may put one figurines on one of the plateaus. If one of these is shot down, he/she takes it back and also takes one pillow out of the box. The first player to get all four pillows into the box is the winner.