Freezone is a feature in TrackMania Nations Forever, introduced by Nadeo as a response to its declining advertising revenue. Basically, all the servers on Nations Forever are Freezones, which have a 40 player limit. They can still enter other servers, but they must favorite them first, and they can only favor five of them. This is to encourage them to buy a paid game, like TrackMania United Forever or TrackMania 2.