Plumbing the depths

When fledgling games developers of the '80s and '90s weren't preoccupied dreaming of replicating Sonic for the home micros, they dreamt of replicating Mario for the home micros. Terry's Big Adventure is Mario clone attempt no. 768, on this occasion courtesy of Gametec. At the time, Terry's (almost) unique selling point was the deployment of his yo-yo as an offensive weapon (as opposed to a polite, friendly weapon?). When not busy harvesting mushrooms and leaping at dangling keys located at the top of end-of-level towers, Terry unfurls his favourite toy to knock out the local wildlife, which not so coincidentally includes many bipedal hedgehogs.