It is a very good game from what I remember about it on the NES. Think of it like this, your swimming around in this submarine and your A/B buttons are your turn signals. As you go by pillar, you hook left with A and right with B(or vice versa). You go through the pillars turning on parts of a picture. Once you get them all, you've beaten the level. If you recognize what the picture is, you can save time by just going to those areas. Its pretty awesome and I'd love a copy for my NES. At least, I don't think I ever found a copy to buy.