Unfortunate news regarding Tobias Foxington, Creator of UNDERTALE and DELTARUNE. Shortly after the release of Deltarune: Chapter 3 and 4, his hand caught on fire due his "Fire Writing" When asked, Toby said " "

When developing Mario Bros. for the arcade, before deciding on Luigi, Nintendo considered adding a brother named Gustavo to be Player 2. He was later scrapped due to "Being too evil"

Hey did you know gaming did you know gaming super mario bros 2 was actually doki doki pa

In the files of the original Super Mario Bros. there's a bunch of unused blocks from A-Z including ! and ? Only the ? is used in game, and the rest were removed in future revisions.

Before the launch of Sonic The Hedgehog for the Sega Genesis, SEGA briefly considered changing Sonic's fur color to green. This was later scrapped as a bug emerged that made his eyes too dilated, and would cause him to stop responding to controller inputs. Mockups Below

Back before Super Mario World released, there were rumors that Nintendo would release the newest Super Mario game on the Sega Mega Drive/Genesis. When asked, this is what Shigeru Miyamoto had to say

In the files of the original Super Mario Bros. lies 6 unused sprites for Mario and Luigi's other brothers. They are each called "Snoose" "Guava" "Ricardo" "Skinny Joe" "Baby Boom" and one simply called "Green Evil"