Add in sounds and music to the game, and customize the GUI in the ways we talked about earlier.

Create levels of your own. Danny Calleri has created a really nice level editor called Toast Editor that you can run from your web browser to design levels graphically. To use it, go to http://dannycalleri.github.io/toasteditor/index.html. When exporting, use the C++ option, and replace the top line with our levels line, and add new int [] to the beginning of every line in the array.

Going one step further, instead of creating arrays for the levels, it is possible to load in text files in Unity so that you can load the levels from a file. For more information on text assets, see http://docs.unity3d.com/Manual/class-TextAsset.html.

As it stands, when the player hits one of the orbs, they can jump...