If it’s a Mario experience like no other that you’re looking for, you’ll find it in these unusual fan-made levels. They range from custom Doom and Half-Life maps to M.U.G.E.N — a freeware 2D fighting game engine — Mario. Continue reading to see our favorites.

1. Super Mario Doom

2. Half-Life Mario

3. FPS Mario

4. Unreal Tournament Mario

5. M.U.G.E.N Mario