Custom Games are new experiences coming to Dota 2 that are created by the community. These games can be anything from a grand brawl between ten Invokers, to a story-driven dungeon adventure, to something creative that no one has seen before.
The addition of custom games represent a continuation of the tradition that gave birth to Dota, Team Fortress and Counter-Strike. Valve want to build an ecosystem where you can experience something new every time you launch Dota 2.
If you’d like to begin creating a Custom Game of your own, check out part 2 of the update site to learn more about the new custom games.