[droithomme]

"The big question is: do they actually take you all the way to Tetris?"

In Part II, when they introduce the java like programming language, the assignment is to write a game. One can write whatever game they wish. Tetris is one possibility. I myself wrote Tetris so I know it is possible, and it is possible to implement using the architecture developed in the class. However, not everyone is forced to implement Tetris at that point. They have the freedom to choose other classic games, or even new games if they wish.

After this assignment comes both the full compiler and the implementation of the operating system.