You could try limiting it by rating, so any games below like a 60 or 70 wouldn't be allowed in? THat may help the number narrow a bit. Could also try sorting it by game platform maybe, and have the winners of those rounds (assuming they arent the same,) compete in a vote at the end. Then, if any games tie, you jsut narrow down the final vote to whatever games were different. It's doable, and then maybe at the end you could have a write-in for honourable mentions that people could vote on for whatever else didn't make it into the main vote.