Basically an expanded-upon Armored Core 1, with better levels, visuals and more parts to mess around with. Leos Klein is an interesting character and I wish he and the frighteners had more presence because there's a pretty good story in there. I'm biased because this was the first Armored Core I ever played, but AC2 is an all-timer. Banger soundtrack too, you could honestly just listen to that on its own as a solid DNB/techno album.