ToeJam & Earl: Back in the Groove! - Repeated Duplication Exploit
2There's currently a bug in the game (ver. 1.2.2) where Amped Mystery Presents leave a normal variant after being used instead of being fully consumed like a lot of presents do. This exploit requires a lot of searching and luck, unfortunately.
Steps:
1. There are two ways to start, both difficult to reliably recreate
a. Obtain 2 "Amp Present" presents and a MYSTERY (? Box, not the same as unindentified) "Duplicate Present" OR
b. Obtain 1 "Amp Present" and an already Amped MYSTERY "Duplicate Present"
2. Once the Mystery Duplicate Present is Amped, use it and duplicate your remaining "Amp Present" once and use the remaining duplication on any desired present
3. Amp the "Duplicate Present" again and repeat
You could theoretically use an Amped Mystery "Amp Present", since the glitch is in all Mystery variants. Keep in mind that Men in Black directly exchange your unique gifts with Mystery variants of the exact same effect and quality (e.g. Broken/Amped), so if you have a unique Duplicate Present, drop everything else and get hit by one of those guys to transform it into a Mystery variant.
The requirements for this exploit are very luck-based, so it's not something you can do in every run without significant back-and-forth level exploration. I still found it very interesting though and I think it's worth documenting.
Once you're able to do this, it obviously lets you break the game completely. If you duplicate presents beyond your current carrying capacity, they will still remain in your inventory, but you obviously can't pick anything up until you've dropped enough of them to have free slots.