I'm a Flash game developer and I want some cool fonts. Some of the fonts I downloaded say they're free and there are no notes included. It's fine to use them for commercial purposes and without credit I assume? Thanks

When it is for commercial use, as is in your case, always first contact the designer.

Note: It is impossible to give you a clear answer as long as you don't tell which fonts you are thinking of. Cool maybe cool but is also fuzzy.

http://www.dafont.com/squaretype-b.font

That is the font I'm thinking of. I would honestly think that it would be fine for commercial use, he says it's free, not just free for personal use, and he doesn't say anywhere I have to give credit :P

Again, if you want to use it commercially, ask first. Is this really so difficult to understand? Send a PM, send an email, ask first.

free means free. no readme, no website, no additional informations. Just post a PM as suggested, it is the legal minimum search.
Anyway, giving credits is always cool. You're using the artwork that someone gives you for free, a little thank you in the credits won't cost you a leg

Exactly, even though it says no credit is required, you know the person who provided the resource to you would still appreciate if you did credit them, as vinz said, "credits is always cool".