Peggle Extreme is a variant of Peggle Deluxe. It was exclusively developed for Valve Corporation as a freebie for all The Orange Box-buyers.

The gameplay remains the same as in the original. You still have to use a metallic ball you shoot from the top of the screen to clear out all the orange pegs on screen. But the screen isn't solely filled with orange pegs. There are several kinds of other pegs which are more or less useful like the green peg which allows you to see where the ball will fly once shot or the purple peg that gives you a point bonus. All pegs have in common that the ball bounces realistically off them but ít will eventually find it's way to the bottom. There it is either greeted by the great pit of nothing or, if you timed your shot right, fall into a bucket that moves from side to side. If you hit the bucket, you get a free ball.

Each peg gives a different amount of points and if you make a especially long shot or make enough points with one shot, you get bonus points.

The game features ten all new normal challenges and five Master challenges which are all inspired by games from Valve Corporation. So you clear the pegs for example off a picture of a strider. Peggle Extreme also features some of the sounds from Half-Life 2: Episode Two, Team Fortress 2 and Portal.

You can also play against the computer or a friend in a hotseat duel-mode.

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