The students must go through the ship (e.g., Fig. 3c, 3d, 3e,
3t), solving different balancing problems in order to get
through to B.I.L.L.'s mainframes and shut it down to free their
teachers. After going through three different zones, the
students are able to shut down B.I.L.L., which gives Baley and
Brenda a chance to fix the system and return B.I.L.L. back to
normal.