Which version of Visual Boy Advance are you using? Is there a particular graphic that's appearing corrupted, or is it the OAM Viewer in general? For unused stuff, and assuming there's no graphic compression, you could use a program like YY-CHR and see what's in the ROM.
The OAM Viewer seems to work just fine on my copy of Visual Boy Advance 1.7.2
![[Image: 8cDp056.png]](https://i.imgur.com/8cDp056.png)
EDIT: It just occurred to me that if you know the unused graphics are part of a certain micro game, you can likely find them already loaded into Visual Boy Advance's Tile Viewer.
![[Image: tLtPXTJ.png]](https://i.imgur.com/tLtPXTJ.png)
The OAM Viewer seems to work just fine on my copy of Visual Boy Advance 1.7.2
EDIT: It just occurred to me that if you know the unused graphics are part of a certain micro game, you can likely find them already loaded into Visual Boy Advance's Tile Viewer.