Originally posted by: JoePail
My criteria for putting unreleased games on cartridge: It should be at least a bit playable.
- Hoppin´ Mad: Still need to do some research about it. That game might get on my list
- Arcadia VI: As far as I know it´s almost not playable
- Kitty´s Catch: In a way it´s more like a homebrew. A single guy programmed it for himself, but later tried to get a publisher for that game
- Huge Insect: A released Sachen game
- Poke Block: What´s that?
- Buzz and Waldog: It´s just a sprite swap of "Koko Adventure", the second playable character is different. There are about 5 or 6 games from South Korea, but "Buzz and Waldog" is the only one that was supposed to be released in the west.
- Big Nose and the Witch Doctor: Basically a demo of "Big Nose Freaks Out"
http://www.nesworld.com/bignose_exposed.php
Unreleased games are not always just a black-and-white issue. Games like "Legend of Robin Hood" and "Free Fall" belong to the grey area in between, those are more like prototypes than unreleased games.
There are multiple builds of Robin Hood, varying degrees of completeness. You have an Airball proto, but I think there are like 3 different "complete" builds of that game, so you may want to look into that more. I mean, you have Bio Force Ape has a "final boss" that can't hurt you and the whole thing is like a single level that you can finish in 15 minutes. Zero doubt by most that the game wasn't "finished".
Arcadia VI is very, very early and not worth having on a cart except for the novelty.
Kitty's Catch isn't a homebrew and would never have been viewed as such. The word and idea of homebrew didn't exist when it was being developed.
Hoppin' Mad wasn't finished. There were two known prototypes, discovered completely separately from each other, both by me. The game had two finished levels, and a third level without enemies. To my knowledge the ROM of the prototype is not currently available.
I guess the other thing you would be missing is unreleased games with ROMs that are preserved but not publicly available. For example, I have a fully playable nearly bug free version of the unreleased Fun House, but it isn't "out there".