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Pull the pin challenge is a brand new pin-pull game. Play and have endless fun in multiple levels!Pull the pin to let all the balls fall into the bottom container. Also,you may notice that some balls are colorless. They need to touch at least one colored ball to get color. So simple yet so interesting! At the same time,three obstacles（ bombs, pegboards and black holes）may get in your way，watch it！Get ready to train your brain and relax！
