Has anyone actually played both of these? It's hard to tell for sure from the pictures on my site, but it kind of looks like they might be the same game, just with different LCD panels. The artwork on both of the games seems to suggest the object is to get away from someone/thing throwing stuff at you...
I only played Monkey Kingdom and it was long long time ago, never owned it only played on a friend's unit. It's very likely they use the exact same ROM as you say though, but they will still need to be dumped I guess so we can prove it.
