Up for a little guerilla warfare? You asked for it. You're behind enemy lines, armed with only a knife and a mission: to free dozens of POWs hidden in an isolated, well-armored camp. If you're good, you'll pick off the heavily-armed enemy guerillas, one by one, and grab their bazookas and hand grenades. If you're great, you'll turn their weapons against them, to blow away a pack of attack dogs, a fleet of choppers, and a whole battalion of guards. But make one mistake, and it's all over. For you, our POWs... the future of the Free World!

Here is a hack for Rush'N Attack which changes the level layouts and adds some difficulty with harder enemies placed in the levels.

Rush'n Attack (USA).nes - NOINTRO
CRC32: ED2C6A3B
MD5: 332C8C5202D4195A567D831F1197C563
SHA-1: 0AD3979BA3C7696166FB60B0461F4409DA653303
SHA-256: CC5EC973848EB372E08EE1F832AA76C8AF6215EDD14100866EA202F06006D2DE