This game has the same name and graphics as Indestructotank and is probably made by the same people, but it's a different game. This is basically an advanced shooting game. Different aircrafts are moving from left to right and you need to shoot them before they pass the screen. The interesting part of the game is that you must not click ON the aircraft to hit it. It takes some time for the missile to reach the target and you need to click BEFORE the aircraft. Besides, some aircrafts are closer and some are farther, so you need to calculate the point where the aircraft and the missile will meet. To understand the game's principle better, try in-game tutorial before starting.