1st game with a toggle console?

[adx]

As the title said.

Earliest game I can remember to feature such is Quake 1

[Dark-Assassin]

It's usually referred as to "Quake Style", so perhaps it is at least the first mainstream game to have it.

[DaMan]

Cheat codes haven't been the same since then. We went from that reference I get it or what could these series of letters stand for to GOD and NOCLIP.

[leileilol]

Abuse clocks in slightly earlier into 1995, though it's far more limited with its use. Given the game's linux heritage from the start it's not too surprising.