DOTA 2 could add custom game modes in future, according to the latest patch notes.
The latest patch notes for the July 26 update include files that reference a new mode named Holdout.
Played on a new map, Holdout is suggested to be a Horde-style mode where players defend against waves of enemies. There are ten rounds, nine against couriers and a tenth against a new unit named Slithereen.
There is not much information on this as of yet, but as the story progresses, we will keep you up to date. Let us know your thoughts in the comments below!