Is it a game? Is it a tool?
The basic idea is to take a hastily created drawing and work it out (that is to say refine and repair it) so that it works in two or more perspectives.
For additional challenge (i.e. for more experienced artists) add in a target style to hit such as limited animation style (als Hanna Barbera) or Disney or one of many anime styles.
Here’s an example where the target style is basically that of the character used for demonstrating walk cycles by Preston Blair. Note that much of the interpretation is pretty straightforward but the shoulders and hips get ‘repaired’: