Contests were released in mid 2005 and ended in late 2009. They are competitions that users enter to compete for prizes. Contests continued on in early 2010 with a slightly different format, but were discontinued in early 2012. In 2017, 5 years after the last contest, ROBLOX made a new contest called the Voltron Robot Building Contest. The original contests began in mid 2005 (as seen on the Wayback machine) and do not happen very much at all now. The original contests would be put on Roblox's Blog pages. The host was one of the people from the staff. Their prizes were also hard to get such as video contests.
The first contest started on June 17th 2005, it was named "Fend off the bots!", in which you have to build something to stop robots from catching you.
More contests continued on over the months, such as Steer the Spheres (#1 and #2) and Balance.
Contests were sometimes criticized when users won a contest with a place that had little-to-nothing to do with the overall theme.
Due to the feature being removed on an unknown time and date during 2012, it sparked some outrage among the community. Users have criticized Roblox for wanting to hold sponsored events for the community rather than simple, unsponsored contests.
On the prizes page, it shows the prizes. It will have prizes for Highest Rated Places, and sometimes prizes for Most Accurate Voters.