As its name says, this pit trap is notable for being well-hidden. It is covered by a bunch of boards that break when at least 50 lbs. goes onto them, and resetting the trap means remaking the floor boards.
Detect: Per-based Traps at -6.
Disarm: DX-based Traps at -2.
Circumvent: DX or Jumping.
Evade: Dodge at -1.
Effects: 1d+2 crushing from a 3-yard fall.