The cartridge.
The Super Hits 2000 Color 12-in-1 is a multicart cart for the original Game Boy, made by an unknown company in 2000. It includes 12 games, which are, except Sonic 6, licensed.
There is also a version called the Super Hits 2000 Color 32-in-1, which adds 20 more games to the previous 12. These are:
Taz-Mania
Casper
Mario 1 (Super Mario Bros.)
Tetris
Flip Pool
Yakumon
Motocross
Bombjack
Tennis
Gee Buck 2
Small Genius
Mario Legends
Super Tetris
Games
1. Mulan (Disney's Mulan)
2. Sonic 6 (Speedy Gonzales hack)
3. '99 World Cup ( Possibly FIFA 2000 due to FIFA '99 only being released on the N64, PlayStation and PC, or FIFA '98 for the Game Boy)
4. Godzilla
5. Barbie Girl (Barbie: Game Girl?)
6. Hugo
7. Mickey's Chase (Mickey's Dangerous Chase}
8. Superman
9. Spiderman (The Amazing Spiderman or one of its sequels)
10. Solar Strike (Solar Striker)
11. Bugs Bunny (Bugs Bunny: Crazy Castle?)
12. Duck Tales