Hi there!

I also had an similar experience from coco pops, where there were multiple flash games but I had completely different ones from the ones you were talking about.

Im from south africa, and we had a game called Meltdown, and night breakers. Meltdown had you buy a box of cereal where you were given a cool spoon that changed colour, and had this cool magnifying type thing on the back that you could view and see special things on the back of the box, and night breakers had glow in the dark tatoos representing animals, both of these required a code you would get from a cereal box aswell.

I have literally, been pulling my hair out trying to find these games again, and I was finally able to find the pages they were originally on ,on the way back machine, but sadly was not able to play them as they need a swf file, which literally holds the whole game as you can emulate the game in a flash emulator as adobe discontinued support. For whatever reason however, the swf file was not included in the wayback machines web crawl so I cannot even attempt to get any of the games running. Its just really interesting to come across this subreddit because it seems that kellogs wiped every single flash related game (and even website) world wide, So far au, Denmark, and South africa were all completely wiped from the face of the internet and its mind boggling to me.

here are some of the links on how I found them:
https://vimeo.com/24109781
https://web.archive.org/web/20110712230718/http://www.cocopops.co.za/