Valve has disclosed details of the Steam experience designed for PS3, which is set to debut next week with the release of Portal 2.

Portal 2 offers cross-platform matchmaking, gameplay, friends, chat, and achievements, all powered by Steam. Steam on the PS3 also saves co-op game progress and single-player saved games to the Steam Cloud, enabling players to pick up where they left off on any PS3.

A Steam overlay for PS3 provides access to both PSN and Steam friends, displaying their in-game or online status and providing quick access to text chats, player profiles, friend requests, and game invites.

Steam Achievements are earned alongside PSN Trophies and are also accessible within the Steam overlay.

Steam on the PS3 provides access to all of these features once the player has linked their PSN account with a Steam account - done from within the game.

Linked players of the PS3 version of Portal 2 can also access and play their copy of Portal 2 on any PC or Mac by redeeming an in-box access code on their computer.

More details can be found at the Steam Support Knowledge Base.