Zooo is a fun game. I play it a lot on the toilet. The games are short enough to pass the time, 3-6 mins usually.

User Rating: 8.2 | Minna no Soft Series: ZOOO GBA
Visually cute, but not offensive. Musically charming. The short games make it ideal for pick up and play situations. There are 5 different game styles, but they all involve matching up coloured blocks. I’m sure I’ve played this as a flash game on the web somewhere. I’m sure you know the type. I don’t know if there are any hidden extras. I’ve not found any yet. Maybe I need to get a higher score in each game style.

Summary: If you have difficulties matching up coloured blocks, then this isn't for you. If you have difficulties passing time in the toilet, give it a look.