Despite being such simple games, Panda Adventure and Rings has a lot more going on in its ROM.
Panda Adventure[]
Unused Graphics[]
The bobcat enemy in the game was planned to have a longer tail. The fact the extended tail doesn't connect properly probably means the tiles for it were ditched early.
The Rinco logo (with palettes assumed) can be found here. Apparently, Ramar International was supposed to publish Panda Adventure and Space Shuttle Exploration at some point but it never happened. Unlike Space Shuttle Exploration, there's no unused intro for this game.
Unused Music[]
These can be found by going to hex address 0701 in FCEUX and setting it to the correct value below.
23 - Rinco Fanfare
A fanfare that sounds like the one used for the copyright screen in The Dragon.
24 - Unknown Track
A weird sound effect; its purpose is unknown.
Rings (Super New Year Cart 15-in-1)[]
Removed Title Screen[]
Rings was supposed to have a title screen but in the Super New Year Cart 15-in-1, it was completely removed. To access it, change the value in hex address 0007 to 03 while on the select screen.
Unused Music[]
These can be found by going to hex address 0701 in FCEUX and setting it to the correct value below.
Rings only uses 4 tracks on the Super New Year Cart 15-in-1 but it has a few more tracks that have gone unused within its ROM:
20:
Originates from stage 5 of the original version of Titenic (the track is kept intact in the 2005 Super New Year Cart 15-in-1 version of the game, and would later be reused in King Fishing and Harry's Legend).
22:
A track that likely originates from King Fishing.
25:
A rendition of Ottowan's D.I.S.C.O. The earliest known use of this track was in King Fishing. It would also be used as the music for the games menu on the Samuri 60 in 1 plug & play console[1], which was produced in collaboration with Hummer Technology.
26:
A track that likely originates from King Fishing.
27:
A track that likely originates from King Fishing.
29:
A track that likely originates from King Fishing. This was also used in the Drumfire game on the Samuri 60 in 1 system.
2B:
Resembles a track from Dwango5. Likely originates from King Fishing. This track would also be used in the Cute Heads game on the Samuri 60 in 1.
2C:
A track that likely originates from King Fishing. It would later be reused as the music for the Star Bank screens on the Samuri and ZDog plug & play systems.
2D:
Rendition of the BIGCITY.MID song, which likely originates from King Fishing. This track would later be used for the title screen used for mini games on the Samuri 60 in 1 system.
2E:
Supposedly a rendition of Jethro Tull's Aqualung. Not used in any known Hummer Team/Hummer Technology games, although it exists as unused song data in King Fishing.
2F:
Rendition of BLUES2.MID. Not used in any known Hummer Team/Hummer Technology games, although it exists as unused song data in King Fishing.