Zoo Hospital is a refreshing game for parents that really don't want to support violent play. Nothing about this game is remotely violent and there aren't even many overtly competitive elements. If you work quickly and make good diagnoses, you'll receive better scores but the scores don't really matter. As you play the game longer, you'll win awards for treating certain types of animals, regardless of score. The only possible source of frustration for kids may be in not figuring out what is wrong with the animal or not being able to master some of the controls.
The story begins with your Aunt Lucy inviting you to be an intern at her zoo. She pretty much turns the examination room over to you, but stays close by to give you feedback and information on the different tools you have available to help sick animals. When you're not treating an animal, you are free to browse the zoo and read lots of interesting facts about the different animals. The game doesn't require reading skills really, but it helps. All the little facts on each animal will be interesting to older kids, at least those able to read. You'll know when an animal needs help because its icon on the map will start flashing. If you tap the icon, you'll enter the examination room where Dr. Lucy briefs you on the animal's condition. There are lots of symptoms you'll see in the different animals, and you'll sometimes see the same animal more than once during the game with new issues.
Once you know the symptoms, it's time to inspect the animal. There are a wide range of tests that let you measure basic stuff like temperature, weight, and pulse. More advanced tests check blood and skin or let you pull x-ray reports. Some tests, like weight, are one-and-done type tests. You grab a little heart icon and drag it onto the animal and the report comes up. Other tests are available for different parts of the animal, so you can inspect an eye, mouth, or body with your magnifying glass. After you run the test, you'll see the results and be able to check against a special computer that shows the ideal results. A few tests require that kids be able to read numbers but most of them are visual checks. You see the animal's eye and if it looks dirty you need to operate. The "Operate? Yes/No" choice is always presented and if you make the wrong choice, Lucy will send you out and tell you to come back later. It's pretty low-key, not like you're evicted from the ER... In the early stages of the game, you'll find that successfully treating animals will lead to new animals being delivered to the zoo. It doesn't take long for the zoo to fill up and after you earn all your medals, there isn't much else to do. The replay value is decent and there's a co-op multiplayer, but Zoo Hospital is a very light-weight game. It's appropriate for younger kids and a lot of fun, but it doesn't hold up as a long-term investment. The co-op is neat because one DS performs the operation while the other DS keeps the animal calm.