Prereleases, or prototypes, are incomplete versions of games. Prereleases may be created for the purposes of playtesting, bug reporting, or advertising.
Games can change significantly between the production of a prerelease and the release of the final version. Prereleases often have many glitches or bugs, and some features from the final game may be different or missing entirely.
Note: Games in this category should not be put into any other category on this wiki.