Very simplistic and pretty slim in content, but it's an enjoyable relaxing game.
Absolutely all the controls happen on the lower touch screen of the 3DS, there are no functionality to any of the system buttons, so it's a stylus in one hand and the system in the other. At the beginning, I didn't really got the game, it wasn't really that hard to complete the first level and when you consider that there are only 7 levels on the game, I was quite disappointed. The game got harder and to extend the life of the game, they make you beat the level with three different submarines in order to unlock the last levels. cheap trick, I now.
I just had a really good time laying in bed and spending a few minutes playing this game at the time. I can see that this game could make some people mad, but if you have low expectations and can fin this game for a reasonable price, it can be worth a play, or just rent it ;)