Magic Jewelry

Magic Jewelry is a Columns clone by that one guy who made all of those clones and multicart homebrews for the NES.

Hidden Logo
At the game over screen, hold Select + Right then press Start to see the developer's logo screen.

Anti-Piracy
If either check fails, the game locks up.
 * Upon starting a new game, the game performs a checksum on the CHR data.
 * Upon reaching a new level, right before spawning the magic block, the game performs a checksum on most of the PRG data.

Hidden Features
If you hold Select while pressing A or B, the current piece will flip vertically rather than just shift the colors around, a nifty little trick that isn't mentioned anywhere. Further, since vertical flips aren't part of the Columns franchise, it's unlikely that most players would know it's possible.