Game:
Don Doko Don (ported from mapper 33 to VRC2)
Mapper:
VRC2
PRG-ROM: 128 kB
CHR-ROM: 256 kB
My comments:
There is additional 2 kB ROM mapped at $6000-$7fff (only A0-A9 wired). It is some kind of patch,
that game jumps and executes code from here (probably modified routine to switch bank,
which cannot be modified in original rom due to insufficient free space)