Portal 2
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!

by BitMango, Inc.
Looking for a free brain game in the Puzzle Games category? Roll the Ball® - slide puzzle by BitMango, Inc. is available for iOS. Features: Multiplayer. Rated 4.6/5 across 16.8K store ratings.
Here's a tricky puzzle game for you clever people!
Roll the Ball® is a classic with a modern challenging twist.
Ready to roll?
ROLL THE BALL-SLIDE PUZZLE FEATURES
►Thought-provoking brain teaser to improve your agility and hand-eye coordination!
►FREE simple yet extremely addicting puzzle game
►Over 3,000 challenging LEVELS to solve! Get sliding!
►No penalties & time limits! Enjoy at your own pace~
►Bonus rewards & hints available to guide you.
HOW TO PLAY
►Slide tiles to create a connecting path for the ball to roll to the GOAL!
►Set a new record by earning the perfect 3-star rating.
►Select various modes, including Multiplayer, for more excitement!
-Roll the Ball-Slide Puzzle is available on mobile phones & tablet PCs.
-Roll the Ball-Slide Puzzle contains ads varying from banners,
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