square
A box to move around the screen in front of a turning cube, to music: the program to start from, which the tutorial writes.
Controls
The directions move the box. Start pauses the music and starts it again.
It is the smallest program that has the parts most programs need: the frame loop, the controller, files read off the disc, a model drawn in 3D, and music. The music and the cube are read off the disc while the frames go on, with a bar for how far the reading has got; if the disc cannot be read, the program shows the box alone and says which file it could not read.