In the immortal words of our beloved publisher: “Chaos incarnate Croteam and professional hype-people Devolver Digital have launched Serious Sam VR: The First Encounter and Serious Sam VR: The Second Encounter on HTC Vive and Oculus Rift via Steam.”
http://store.steampowered.com/app/552460/
Visit South America, ancient Mesopotamia and Medieval Europe, and don't forget to bring your chainsaw. Actually, bring two: dual-wield your new toys to defeat Mental or use your arsenal in a deathmatch against "flat peasants"!

That's right, SSVR: The Second encounter will be getting a free Fusion 2017 update, bringing cross-platform co-op and other multiplayer modes (VR vs non-VR) and Steam Workshop support.
SSVR: The Second Encounter is launching with a special 25% discount (until April 11th), and there's a 25% discount for the entire Serious Sam VR budle – thank you for supporting Croteam's VR division!