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Dota 2 now has gamepad support, alongside new event mode and battle passGetting ready for Steam Deck
Getting ready for Steam Deck

More strangely, today’s update also introduces experimental gamepad support.
C.P.U. F.R.I.E.N.D.S. | Mystery Steam Reviews (Video Games With AI Companions)Watch on YouTube
C.P.U. F.R.I.E.N.D.S. | Mystery Steam Reviews (Video Games With AI Companions)

Every hero should work on a controller, but it’s an experimental feature and “still evolving”, say Valve. They’ve also posteda controller FAQthat explains how to enable the support and how it works.
Valve have been making changes to some of their older games recently seemingly to prepare them for next year’s release of theSteam Deck.Half-Life 2, for example, received a beta branch update that added support for new resolutions, a scalable UI, and a Vulkan renderer that will make it more compatible with Steam Deck’s Linux operating system. Given thatSteam will label games based on their compatibility with the Deck, I imagine Valve want their own games to tick all the boxes - and that means working with anaologue sticks and X/Y/A/B buttons as Dota 2 now does.