"Portals... found buried on Earth. Who made them? We know not. Now we humble humans use them to travel to the stars."

Introduction
We have a new mission for you. Planet: Gliese 581 g. Tests indicate relative safety. Space suit will be required. Gravity 0.15g. You will find oxygen bubbles in the atmosphere.

Beware of the fauna, stay alive and find a portal to come back for fame and glory!

Modifying the game
You can create new levels for the game or modify the existing ones and share with your friends. See the file MODIFY.html included with the game.