Fun article, I really like looking at this video game stuff.
Nightmare Circus is stupefyingly real. It was actually released in Brazil, with that box art.
And I actually had, maybe I still have but I can't find it, a Watara Supervision. It's kinda like a lower tech Gameboy, something that's like an evolutionary step between a Tiger LCD and a Gameboy. There's lot of blur and the games are primitive and not very good, but there was a Breakout type puzzle game on it called Crystball that I actually really liked.