Coastline to Atmosphere - A mod set in the Half-Life 2 universe, following Gordon Freeman after the events of Half-Life 2.Black Mesa - A recreation of Half-Life using the more advanced Source engine.Instead of a portal gun, the player solves puzzles using a mix of these gels that they can spray onto surfaces with a tool they carry. Aperture Tag - A modification based on Portal 2 that recreates the essence of the game Tag: The Power of Paint, the inspiration for the various gels used in Portal 2.
