It is the future and the world is in trouble. The sea level is rising. Trash is everywhere. Genetically engineered animals have gone on a rampage.

Finally, Dutch genetic engineers have created a special animal to limit the damage. This animal is intended to be a hero: you.

You are a beaver. Your mission: to build a dam and protect the land from the rising sea as long as possible, so that the areas can be safely evacuated! Clean up the sea while you're at it.

Gather trash in the sea. Go to the nano-assembler charging device, and charge up on building materials.

Protect your dam! Animals damage your dam and create leaks. Chase them off and fix any leaks!