A sense of progress is key in any educational application. The ring shape allows the user to view (almost) all the other challenges from anywhere. When a challenge is completed, the user will be flown to the next one. Completed challenges will feature a beam going to the sky and/or a nice particle effect. Also, the answer can be "why not?" Everybody loves donuts, and VR gives us the possibility to create endless impossible worlds. The 8 levels that we’ve completed so far have been placed in different parts of the donut world as shown below. For more detail on how each level works see our previ