In my hazy memory, this was an arcade perfect port but with the addition of a 4th playable monster. Cute graphics, big monsters climbing up buildings and smashing them until they fall down, eating people and the soldiers trying to stop you. It's great fun... for about 3 levels, at which point you realise every level is exactly the same and you're just going through the motions of punching buildings until you eventually die from the army attacks. Great for a single credit of fun in an arcade, but not so great for a full-price home video game.