File this under: cool fan-made Mario levels. Super Mario Bros. levels have been created in a plethora of games, including but not limited to Half-Life, Unreal Tournament, and more, now here is a Left 4 Dead version for your viewing pleasure. Continue reading for the video.

Bill’s jumping is of little use in this board though – everything’s built too high. He busts out blocks the old fashioned way, with firepower. For the pipes and the final ascent, the creator, Chubdzoomer, evidently put in ladders.

[via Kotaku]