Ultimate Chopper is a very fun game where you can practice your observation. Your task in this game will fly between obstacles, you have basically only one life, so be careful. As for the control of the game, it requires insight. You must click with the left mouse button and hold it until you reach the required height, then you can let it go for a while, but if you are too low, you must hold it again. It takes a bit of patience, but the game will certainly have fun.