Gex: Enter the Gecko

Gex: Enter the Gecko, released as Gex 64: Enter the Gecko on the Nintendo 64, is a 1998 platforming game that was used as a recurring joke in The Dark Age of Nintendo.

In The Dark Age of Nintendo
The game appears as a recurring joke in the series, being used by Scott Wozniak to get Rex Mohs and Jeb Jab to play low-rated 2015 Nintendo games with him.

In the final episode of the series, Gex: Enter the Gecko is used to defeat a sewer monster created by copies of Chibi-Robo! Zip Lash.