This was only used in one episode, as the Grumps couldn't decide whether the episode would be a normal episode or a Game Grumps Vs.
This logo has so far only been used for their second Megaman X playthrough. Dan was busy with other events at the time, so Arin decided to play the game by himself. The logo starts normally, but when Dan usually appears, there is 2-3 seconds of silence, and then Arin sings "And I'm the Game Grump!", the S in the normal logo is then crossed out.
This logo was only used in part 7 of their Super Metroid playthrough, which was only because during the cold open, Arin "Egoraptor" Hanson parodied his own intro by saying "And we're the Dimple Pumps!"
This logo was only used in their Sonic the Hedgehog (2006) episode, "Sunny Day" where Arin accidentally calls their show Grep. This logo became extremely popular with fans, and an animation and t-shirt was made off of it. The Grumps also replaced their Facebook profile image with this for around a week at one point.
This logo was only used in their Super Castlevania IV episode, "Enhancin' Danicin' Hanson" where Arin calls their show Drump.
This logo was only used in their Super Castlevania IV episode, "The Library of Doom", where Arin calls their show Gorp.
This logo was first used in the Super Mario Maker episode, "Dan's Nuts!". This logo was used as Danny decided to play, which is a rare occurrence.