Little Ninja Brothers isn't Super Ninja Boy's prequel. It's its predecessor. A prequel is made (in the real world) after an older game, but (in the games' world) takes place beforehand. So, Castlevania III is the prequel to Castlevania 1 & 2. But Contra, say, is not the prequel to Super C.
I LOOOOOOVE Flying Omelette!!
Crawl and 1000