Pull the Pin is a free iPhone game developed by Popcore GmbH that challenges players to think outside the box and solve physics-based puzzles. In this game, you'll be tasked with removing pins in the right order to make sure all the balls go into the pipe. The game features satisfying graphics and innovative levels that will keep you engaged for hours.

The gameplay is straightforward: gravity pulls the balls towards the pipe, but pins block their path. You need to remove the pins in the correct order to clear the way for the balls to reach their destination. However, the game adds a twist by introducing colorless balls that need to touch a colored ball before going into the pipe to spread the color. With over 200 levels to play and new levels added regularly, Pull the Pin is a game that will keep you entertained and engaged for a long time.