Phase 1
[Day 3] Started by talking to the Underpants Gnome in your bedroom. Collect 5 pairs of Underpants around South Park.
In Mrs. Cartman’s bedroom, in the bedside cabinet.
In Kevin Stoley’s bedroom, in the bedside cabinet.
In Stan’s bedroom, in the bedside cabinet.
In Stan’s parents’ bedroom, in the drawers on the left.
[Day 2] In Kyle’s bedroom, in the bedside cabinet.