Nanosaur

The object of the game is to collect the eggs of five dinosaur and flying reptile species and deposit them in time portals to the future in twenty minutes; at the end of the countdown, the asteroid that caused the Cretaceous–Paleogene extinction event hits Earth. The Nanosaur is equipped with a "fusion blaster" (a basic multi-purpose energy weapon), a jet pack allowing flight, a temporal compass for locating time portals, and a GPS locator for navigation.

The native animals will attack the Nanosaur when their eggs are threatened; species encountered include Dilophosaurus (which spits venom as in the Jurassic Park film), Pteranodon, Stegosaurus, Triceratops, and Tyrannosaurus. As well as hostile creatures, the Nanosaur must also avoid environmental hazards which slow the player down or inflict damage, such as: water, lava, tumbling boulders, and spores from poisonous fungi.

In the distant year of 4122, a dinosaur species, Nanosaurs, rule the Earth. Their civilization originated from a group of human scientists who experimented with genetic engineering. Their experimentation led them to resurrect the extinct dinosaur species; however, their victory was short-lived, as a disastrous plague brought the end of their civilization itself. The few dinosaurs resurrected were lent an unusual amount of intelligence from their human creators, leaving them to expand on their growing civilization.

However, as the Nanosaurs were the only species on Earth, inbreeding was the only possible choice of reproduction. This method largely affected the intelligence of the various offspring, and slowly began to pose a threat to their once-intelligent society.

The game was being ported to Linux by Three Axis Interactive, but the port was never completed. Around 2003, the source code of the game was made available by the developer under a restrictive license. In 2021 an open source version of the game utilizing OpenGL was ported to modern systems (Windows, Mac, and Linux) with the developer's blessing by Iliyas Jorio. Jorio had previously ported their other title, Bugdom, to modern systems in 2020.

Nanosaur Extreme is another version of Nanosaur, released at a later time with heftier system requirements. It has many more enemies and weapons than Nanosaur, and it is described on the Nanosaur downloads page as "what Nanosaur was meant to be – a total kill-fest".