yt-4 is my second tank,i spend lots of time on finish it,so i hope you will like it. act 1 is to start engine,and you can control roll to trun left or right,control pitch to icrease or slow down the speed of the tank (cruise engines are always on, use throttle to control it and break is break,but if you haven't started act 1 before,you may not turn left or right).act 2 is to start engine too,you can get more power by start act2,but it is easy to cause accident,so i suggest you starting act2 when the power is not enough to clamb the mountain,not in normal way(don't turn off the engine which has started in act1). act 3 is to start the ground-to-air machine gun, use pitch and roll to control it,but youshould make sure act 1and act 2 have been off. act 4 is to start the guns.act5 is to open the lights. act6 is to Parachute deployment.act 6 is about the Laser Designator.Please pay attention to safe driving.I hope you can enjoy yourself. Thanks for reading.