There are 16 levels of exciting game play. Completion of each level of the game unlocks the next one that will be a touch more challenging and lot more exciting. The monstrous creature will need your help to get to the end of each level of the game destroying everything that comes in its way. Rex has to feed on the humans that it sees on the screen. Failing to eat up specified number of humans will cause the level to fail and will require the level to be played again. Do keep an eye on the health bar because if it gets empty, Rex will fall down dead.