Among numerous other consoles, an "88-in-1 Joystick" Famiclone was recently added to MAME. This system is effectively a variant of the common "Arcade Action II" 101-in-1 that has been circulating online for years, with the removal of a few games in exchange for a bunch of Cube Technology VT02 hacks (which are quite uncommon compared to the Inventor hack library).
For whatever reason, there are two unused - and as far as I know, undocumented - games in its code: Bon Bon and Air-Launch, hacks of Devil World and Raid on Bungeling Bay, respectively. There may be some other unused games in it as well, though these two stuck out to me given I had never seen them before. Downloads of the two games (alongside an iNES-headered copy of the 88-in-1) are attached below. There is also a 5-in-1 cartridge for this console, though I do not have a copy of the ROM for it currently.