Gun Modules
Gun modules are containers that change which weapon the player's gunboots fire. They are found in safe zones. During the boss fight, heart-type modules spawn inside the arena's sections (the module type is forced to heart in area 5, at most one per section). Each module is stamped with a letter showing which weapon it holds, and picking one up always swaps your current weapon for the new one — a module never contains the weapon you are already carrying, unless it is re-rolled with Reverse Engineering.
Weapons
Module types
Every module also comes in one of two container types, granting a small bonus on pickup:
Trivia
- Shooting a gun module while the Reverse Engineering upgrade is active re-rolls the weapon inside. A re-rolled module may contain the weapon you already have — the only way that can happen.