This was World 4UFree.

Leo typed it into the cracked terminal of his pod, a ritual performed every morning for the last three years. A shimmering portal, no wider than a door, materialized in the gray wall of his cubicle. Beyond it, not the usual dystopian sludge-rain of Sector 7, but a golden beach. The waves made a sound like soft laughter. The sky was a permanent, gentle sunset.

He had four days left. And he was going to spend every single one of them fighting like hell.