In four separate 1989 issues of Video Games & Computer Entertainment, the mail-in game order service Play It Again put up an advertisement featuring a list of games customers could order. Among these is a mysterious title, Yeah Yeah Beebiss I, which is not the name of any one game. This title would reappear in a separate advert for FuncoLand, under the name "Yeah Beebiss I". To add further mystery to this game, it was placed between W and X games alphabetically instead of with Y games. There are multiple theories on the status of Beebiss:

• Some believe that Beebiss is a baby-themed game like Baby Boomer, Rai Rai Kyonshis: Baby Kyonshi no Amida Daibouken, or Bio Miracle Bokutte Upa, given that "baby" sounds like "Beebiss". With Rai Rai Kyonshis being considered the most likely candidate of the 3 for "Rai Rai"'s (A Japanese onomatopoeia associated with China) similarity to "Yeah Yeah", the game's release in 1989, and the presence of other import games on the listing. Rai Rai Kyonshis is generally the most accepted identity of the game.
• One theory proposes that the game was made as a copyright trap to catch which retailers are stealing game lists, something one of the founders of Play It Again confessed to doing, albeit without confirming if Beebiss was among those games.
• A rather strange theory proposes that the game was somehow related to exploring, possibly being Atlantis no Nazo's cancelled US release Super Pitfall II, named for Charles William Beebe, a famous explorer and naturalist.
• Another theory suggests that the title was simply a bizarre, elaborate in-joke that both Play It Again and FuncoLand employees were in on.

The myth of Beebiss would inspire the game Yeah Yeah Beebiss II, developed by popular retro gaming YouTuber John Riggs and based on the aesthetic of Rai Rai Kyonshis.