Invader's Revenge definitely put several new spins on the Space Invaders formula. Rather than facing a formation of 55 invaders, there are fewer than a dozen per any given screen. Even though the invaders look exactly like the forces players faced from the original arcade game, for the most part, they do not adhere to the regular Invaders rule of moving to the side and dropping down a notch when they reach a screen edge, as the invaders mostly move diagonally. They also not only fire vertically, but diagonally as well, at times catching the player's[s'] ship in a crossfire (which is what increases the difficulty level with this game, as it is much higher than most Invaders games in general). Sometimes when an invader is shot, its body will quickly fall to the bottom of the screen and is de