Five Nights at Freddy's GB

"Hello? Hello, hello? I wanted to record this message to tell you about FNAF GB, it's a uh, a video game based on those old Freddy Fazbear pizza places from way back. So we uh, we found an old GameBoy cartridge covered in dust while clearing out one of the old locations. I can't find anything online about a tie-in game from the 90s, so I guess this was a prototype or something?   I mean, I can …