Hey,
I've finally found out how to make the rocket launcher, but getting 80 of those iron mass items will take me a while, at least if I keep doing stage 12-4 until I have enough items to make that many. Is there a faster way to get them?
Further, can anyone tell me how to get the items required for the super yo-yo or the hyper buster blade?
Regarding the piggy bank of contents, it's in 12-4, if I remember correctly.