"Portals... found buried on Earth. Who made them? We know not. Now we humble humans use them to travel to the stars."
We have a new mission for you: planet Gliese 581. 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!
If you find that any level is too difficult, take a look at the OPTIONS - DEMOsection in the main menu to learn how to overcome it.
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.