More after the jump.
Next up is a scan of a Frosties promotion for Sonic Yoyos. The Yoyo's wen't packed in the cereal box: you had to send off for them with coupons. There's also a competition on here that includes a Multi-Mega. Oooh. I wouldn't really want to see Tony Tiger in a video game, though.
Here's one for another Sonic promotion/competition, this time involving Milky Way chocolate bars, and promoting Sonic & Knuckles. I do remember buying a good few Milky Ways to attempt to win the game.
Finally here's one from a much earlier issue of S.T.C (one of the first, I think) of a Sega Game Gear carry case/ Lunch box type thing that also comes with a neat set of pins. I think the promotion was long over when I finally got my hands on this issue, as I started collecting them around issue 20.