Project Borealis is a development team consisting of over 80 Half-Life fans from around the world who came together to create a game based on Marc Laidlaw's Epistle 3 (Half-Life 2: Episode 3) script, released in August 2017. The game is being created using Unreal Engine 4, which will be adapted to feel as close as possible to the Source engine used in Half-Life 2 and its episodes.