In blowgunz puzzle we've been thinking a lot about, spammers and people who tries to abuse the publish ability, therefore we will encrypt our game. We've also been working on some features, to prevent people from cheating the rating system, and to prevent uncompleteable levels.
We've made a system that will remember and lock your voting, so you can't rate on the same level again. That will prevent bad levels to get a high rate, and good levels to get a low one.
To stop un-complete-able levels, you can only publish your level, if you've completed it yourself. So when you're in the level editor you will see a completeable sign, which can show either yes or no. If "yes" is represented it's completeable, and if "no" is represented... well you get the point.
Original post on wackiegames.com