Doki Doki SMB1 Club - Monika is a ROM hack of the original Super Mario Bros. (SMB1) for NES. This version is likely a fan-made modification incorporating elements from the visual novel Doki Doki Literature Club! with Monika. The gameplay retains the original platforming of SMB1, but possibly includes altered visuals, levels, or other gameplay changes to reflect the Doki Doki Literature Club! theme.  It was created by a community member and not officially by Nintendo.

Doki Doki SMB1 Club - Monika

Disk Hacker - Version 1.3 (Japan) (Unl)