File:Quake1.gif E1M4: the Grisly Grotto Game Episode Designer Level Editor Soundtrack Level Theme Previous Map Next Map Specific Information Enemies Secrets New Weapons New Powerups New Obstacles New Enemies New Misc [Source] In this level, the player finds his/her first Super Nailgun, and must find a Silver Key to proceed deeper into the dimension. The player must swim under the large pool of Water, being careful not to drown. This level leads to the Secret Level of the Dimension of the Doomed, Ziggurat Vertigo.