Next to the patient there is a small floating doctor. When you press on the doctor he will examine the patient and find a number of problems which are the puzzles. In the puzzle there is no pressure and you can't lose, and you can leave it if you don't like it. In some puzzles you can use tilt or touch controls and sometimes even both.
An additional puzzle, which appears once all 18 are completed, is placing equipment in the medical kit which is next to the patient. Every time you start a new game the puzzles must be completed again for the kit to appear.
One thing I would like to see is more puzzles, as they can be found in different places but don't really change. It probably won't bother younger children but it would be nice to see some more.
Overall this is a brilliant game, and the graphics and sounds are great. Plus there is no in app purchases, so you don't need to worry about getting unwanted apps and losing money through advertisements. Worth getting for any child!