Alternate version that appears to be cartridge based, but I don't know if you can actually get other games:
Cresta Jungle Kong (19??, LCD, Watch battery, Model# ?)
Looks like it might be a loose knock-off of Donkey kong. Halion has released other games with similar designs (Q*Bert, etc). This has a very Bandai look to the shape of the case, but I'm not sure if they had anything to do with the design of it.
Alternate version that appears to be cartridge based, but I don't know if you
can actually get other games:
Do I have this? Yes, smaller version boxed.