Super Scope 6
Mario makes a cameo flying on a plane, followed by Lemmy Koopa, one of the Koopalings from Super Mario Bros. 3 and Super Mario World, riding a missile.
Shooting Lemmy awards bonus points, while shooting Mario deals a penality.
Super Mario Bros. movie
May 28, 1993
The Devo Gun weapon in the Super Mario Bros. movie is designed very similarly to the Super Scope.
It's used to shoot a de-evolving ray, capable of turning humans into monkeys and Dinohattan inhabitants into dinosaurs (in most cases Goombas).
Mario & Luigi: Superstar Saga
November 17, 2003
The Sniper Bill enemy in Mario & Luigi: Superstar Saga, met in Bowser's Castle, attack using the Super Scope. This is ironic since the enemy itself is a bullet.
Copyrights for both series are held by Nintendo.