Physics puzzle game with 48 unique levels. Use portal jumps, helper balls, gravity switches and more to help the ball through the maze. Do you have the skills to get to the goal on all levels, and still be alive? Compare your skills agains the rest of the world using the global leaderboards. ★ Tip ★ If the game gets to frustrating, please take a break, open the valves, and let out some steam. Then you can come back for more portal fun!