Here's something else for a change:
A dump of a korean pirate multi-cart featuring 20 games, mostly NES/Famicom conversions.
I don't know much korean, but I guess the title means something like 'Super 20 Collection'.
They went out of their way to add new sound effects and music to the games (including a very cheesy Super Mario Bros theme remix).
Game doesn't work on emulators yet because there's a custom bankswitching mechanism involved.
Thanks to Svambo for letting me borrow his cartridge!