Graphics tech manufacturer Nvidia has revealed that Valve Software's acclaimed first-person puzzler Portal is headed to the Android-powered Nvidia Shield, a move which is interestingly the Steam platform holder's first foray onto a mobile device.

One of SHIELD’s strengths is that it’s an open gaming platform. That means gamers have been enjoying the best of both PC and Android worlds since its launch.

Those worlds are now set to collide.

“NVIDIA has created a very powerful and unique device with SHIELD,” said Doug Lombardi at Valve. “Our companies have a strong history working together and we’re looking forward to Portal‘s arrival on SHIELD.”

Valve has previously released a Steam App for mobile platforms, offering a mobile interface to the platform's store and social functions, but none of its actual games. The Nvidia Shield, with its built-in Xbox-like controller buttons makes the device a much more natural fit for Valve's games than smartphones.

Notably, the announcement only mentions the name Portal, and not Portal 2, so its unclear whether it means only the first game, or both. Regardless, it still means Valve has its Source Engine running on ARM processors which potentially paves the way for more Source games, and perhaps even Steam itself on mobile devices.