Earth has changed quite a lot since the arrival of those strange little creatures! They came in number, with no warning at all, and devastated everything. Civilisation was wiped out, the air is now poisoned and the entire ecosystem has changed. The rare humans who managed to survive now have to fend for themselves. Play as one of those survivors and explore the planet, searching for the garden of Eden, a safe place with food and good shelters, which the government apparently prepared in case of a major disaster.