All-Stars SMB2 in SMB1 & SMB1 in SMB3 is a Super Nintendo Entertainment System (SNES) game that offers a unique twist on the classic Super Mario Bros. gameplay. Instead of playing through the original levels of Super Mario Bros. (SMB1) and Super Mario Bros. 2 (SMB2), players experience the worlds with altered graphics and level designs, blending aspects of both games into a single, fresh experience. The original game is not a standalone title but rather a ROM hack, combining different elements. The gameplay retains the core platforming mechanics from the SMB series but with a new challenge of navigating modified areas. It's an example of fan-made content demonstrating creativity within the constraints of existing game technology.  The creator or original organizer is unknown without more information regarding the specific ROM hack.

All-Stars SMB2 in SMB1 & SMB1 in SMB3

Alien vs. Predator (USA)