Two of them. Both free, both start in the browser, neither one asks you for anything.
Seven of the Troop are stuck behind glass. Clear the blocks to reach them, and every so often a question stands between you and the next rescue. On the App Store; Android is in testing.
▶ Play freeRun one big roadway through seven worlds for as long as you can, or find your way through the Wobble Maze to the volcano at the finish. Get caught, and a question can buy you a rescue.
▶ Play free