A pair of Valve classics have launched on Google Play, though they're exclusive to Nvidia Shield devices.
The two companies revealed in a joint announcement that both Half-Life 2 and Portal can now be purchased from Google's store for Nvidia's handheld.
"Nvidia has done a remarkable job bringing both Half-Life 2 and Portal to Shield," Valve vice president of marketing Doug Lombardi said.
"We're playing both games here on our Shields and fans of both franchises can expect the same gameplay they've come to love on the PC."
Both titles are priced at $9.99. Here's Nvidia's announcement video: