The Gift

Mark comes across a strange VR game one day and is a bit suspicious, but curious as well. He decides to make a letsplay video with it, figuring his fans would like to see what it's about as well. Unfortunately for him, that was no game. He is sucked inside to a world completely unbeknownst to him. Having been trapped inside this world after seeing his world fade away behind him, he must explore dangerous hallways of containment to find the exit.

If you're wondering, yes, the "game" is loosely based on scp containment breach.