Nintendo pulled a game from the eShop on April 26 after it was known that creator of A Dark Room snuck in a code editor for players to use.
As reported by Eurogamer, developer Amir Rajan revealed one week after the game launched on Switch that he had included the coding easter egg within the game. Nintendo pulled the game from the eShop shortly after.
Rajan posted his announcement of the secret editor being hidden in the game, which is used through the programming language Ruby, and said it was meant for people to create apps through their Nintendo Switch.
Source: IGN.com Nintendo Pulls Game From eShop After Dev Reveals Hidden Code Editor