The graphics are very basic. The game looks pretty good with its slick menus and overall antialiased look. But this doesn't meen the graphics are great. They do the job, nothing more.
The sounds in ZK is like in any other puzzler. The sound effects are basic, and the music is brain damaging.
Zoo Keeper is a very basic puzzle game in many terms, but playing with the stylus works very well. The game is extremely easy to get into, very accessible, though very hard to let go of. It's very entertaining and will keep you playing for many, many hours. There are several game modes like Zoo Keeper, Time Attack, Tokomana!?, quest, and 2 player battle. Everyone features high score lists of course (though I don't know about the 2P battle), and they are all very entertaining. It's veird, but this is maybe the DS game I've played most of them all! It's very good and you should pick it up if you have a slightest interest in puzzle games.
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Very addictive and hard to put down. Smooth graphics. Every game mode is good. You can pick it up anytime you want. You use the stylus, and it works very well.
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No unlockable extras except a harder difficuly level. It's a puzzler very simular to the other ones out there.