Extermination of Flies

Introduction Jimmy feels that his kitchen is being a the playground of flies recently, you can hear them buzzing with the lamp off, but he can't find them when he turns the light on, that is so annoying, so Jimmy wants a full extermination of his kitchen, kill all the flies! but these evil creatures are so sneaky, please help Jimmy kill them, the amount and lethality of the flies will increase while the challenge goes on. Be careful of the flies' attack, and have fun!