Puzzle Bobble, actually, is definitely one of the more iconic Neo Geo title. If you open it, you may have a surprise. The game was such a success that Snk itself had to butcher other, less successful games (essentially Power Spikes II if I remember correctly), to produce conversions/bootlegs and answer to customer's demand. It has one of the best replayability of the system, it's very fun playing versus, plus, girls absolutely love it. There have been many sequels, but none live up to the original despite the additions, and they’re all more or less unnecessary.