It turns out that when making the game, I inadvertently completed the mastery when trying to complete the normal mission. In fact, I also inadvertently created the game that is the example for the mastery. But I can still infer why adding more complexity to a simple game could be useful. If you make a simple game fist there is less of a chance of there being bugs in the final game. When I made my game, I made all of the levels and then found out that it didn’t work, so I had to change everything. This would not have happened if I tried the first level before making all of the other ones.