The bloodless first-person shooter "Nanosaur", which is also suitable for children, was already supplied with the iMac and is also available on the iBook software CD, but has to be installed later.
The plot is told quickly: In the near future, people will succeed in breeding a genetically improved, highly intelligent dinosaur, the nanosaur. Unfortunately, humans die out and the nanosaurs send one of their own back in time with a time machine to collect enough dinosaur eggs of different species before a large meteor impact wipes out the dinosaurs. So you play against time.
Arrow keys = control
Spacebar = fire
Alt= jump
Option= pick up egg
Shift= next weapon
a/z = jetpack (up/down)