Current games with medals:

Alkie Kong 2, by PsychoGoldfish
Type: Game Rating: Ages 13+ Deliver That Fulp, by PaperBat
Type: Game Rating: Ages 13+ Fear Unlimited Issue2, by Dizimz
Type: Game Rating: Ages 17+ Newgrounds Pass 3, by Nicholas-Deary
Type: Game Rating: Ages 13+ Portal Defenders, by Luis
Type: Game Rating: Ages 17+ Thing-Thing Arena 3, by Weasel
Type: Game Rating: Ages 17+ super sweatshop mastar, by NeNe
Type: Game Rating: Everyone

Here you can find an up-to-date list with medals, as well as several helpful walkthroughs.