Play as a Fast Headcrab.
Controls:
-Attack-
Keyboard: Space
Controller: R2
Touch screen: Button
-Leap (after you become a fast headcrab zombie):
Keyboard: Space
Controller: Button X (on an Xbox controller)
Touch screen: Button
Charts
Roblox disabled public gamepass sales visibility in late July 2020. Sales data collected up to then is still available here for reference.