Joey

In this single screen platform game, you play the role of a kangaroo called Joey who must move around the screen to collect all the boomerangs to move to the next level. Connecting the various platforms are ladders but Joey can fall through the gaps from any height without being hurt. Moving around the screen are creatures that can be avoided or jumped over and if you touch one then you lose one of three lives and you have to start the level again. A clock counts down and you also lose a life if you haven't completed the level when it reaches zero.