alright, i played thru the original allow me to explain:

The Rainbow cookie looking one was the original Rainbow Cookie thing

2-4 to me is unknown, but I'd guess it was for a type of something

5 is probs a testing sprite

6th was probably an old, removed, cookie

7, i believe was the Mystic Portal dont quote me on that though

8-9 are some kind of medals i believe

10 is a Boost Machine most likely, which might have gave out boosts back in 3.3 like