The Steam Controller's troubled trackpads made for a better Steam Deck - The Verge
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Found a Chell prototype, and been having fun testing games with it : r/SteamController
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GDC: Hands-on with Valve's Newest Steam Controller Prototype - IGN
Konig "Boomerang Style" Game Controller (PS3) Review - YouTube
Hands On With Valve's Steam Controller | PCMag
Valve adds thumbstick to latest Steam controller prototype | Eurogamer.net
Engineering Proceedings | Free Full-Text | Gamepad Design for Touch Generation: Evaluation of First-Person Shooter/Third-Person Shooter Game Control and Possibility of Touched-Based Control as Norm
Here's the latest Steam Controller prototype - GameSpot