More secrets

Hello! This update adds some more content to Special Mode, with secrets in nearly every level. Instead of rewarding you with annoying text, the Special Mode secrets reward you with a box that shows up on the title screen. (The boxes in the secret levels essentially just involve beating the levels (or, in Green Hill Zone, getting to the top path).) This is just so you have something to do in special mode and probably won’t affect most people because the gold times are hard.

I’m also going to make the gold times harder for no particular reason. I’m sure nobody will be angry at me for that.