Resident Evil 4 is a game that allows players to navigate through various areas, encountering monsters and finding keycards to access doors. In Chapter 4, players must navigate through a lab and find the wrench to obtain a level 3 security card to continue their journey. The wrench is not in an obvious location, but can be found inside the guts of a Regenerator in the Incubation Lab. To obtain the wrench, players must use their thermal scope to target the glowing parasites within the Regenerator and defeat it. Once defeated, the wrench will drop and players can collect it to progress through the game.