Before having mods old school gamers have ROM HACKS :D
Check the TOP 10 rom hacks from the old school
#10 Megaman In The Mushroom Kingdom
This crossover with Megaman and Super Mari 1,2,3 amazing right?
#09 Super Metroid Redesign
This is the closest we will ever be to have a new Super Metroid for snes.
#08 Sally Acorn in Sonic the Hedgehog
This is the same game but with a different character but somehow it feels different
#07 Mario Kart R
This is mario kart with amazing new levels yeah!
#06 Chrono Trigger: Chrismon Echoes
35 hours of gameplay + 10 different endings + it complete the story between chrono trigger and chrono chross
#05 Mario Adventure
New power ups new levels and a secret way on the end! NEW MARIO YES!
#04 The legend of Zelda Parallel Worlds
This game is awesome the creators even add new songs and increse difficylty for zelda fans this is a must
#03 Oh no More Zombies Ate my Neighborns
This rom hack its what its name More Zombie Ate My Neighborns :D
#02 Super Mario World Return to Dinosaur Land
This hack captures the old feeling of the Super Mario World.
#01 Earthbound: Halloween Hack
This is an alter universe of Earthbound were the heroes didnt succed on their adventure, and also its of the creator of undertale best rpg ever.
You can play all this games just need to buy a flash card and plug in to your snes or play them in your computer
Dont forget to upvote :D