Did you know a Rat once appeared in Office Complex? Beyond this trigger_once, its completely unknown to what the intention was. #RatFacts
Did you know that the Rat appears in Half-Life a grand total of 8 times across 3 maps? They only appear in these Training Course maps: t0a0 - 2 Rats t0a0b - 3 Rats t0a0b2 - Ditto The Rat does not appear in Half-Life: Source, but is supposed to. The entity is still in those BSPs in Half-Life: Source but they had not ported over the NPC itself. They also didn't bother to port over the Tentacle Maw, despite being compiled in HL (but not used and lacks its model.) They did port over the cut Floate…
There's been a few Zoo maps that existed during Half-Life's development: zoo.bsp (a Zoo for all Human NPCs) g_zoo.bsp (a Zoo for all the German versions of the Human NPCs) alien_zoo.bsp (a Zoo for all of the Xen-based NPCs) sprzoo.bsp (a Zoo for all of the sprites in the game) With that knowledge, the attached image shows both a Chubtoad (Xen creature) and a Rat (non-Xen creature) next to each other. If its assumed no Xen creatures were in "zoo.bsp" then this deeply implies that the Rat is in "…