This Is Impressive: Super Mario Bros. 1-1 Recreated In Minecraft And It's Even Kinda Playable

It took Gavin and Geoff of Achievement Hunter about four hours to build Super Mario Bros.' 1-1 level almost block-for-block in Minecraft.

You can watch them "play" the level from two camera perspectives. Then they'll zoom out to show you how the level was constructed. It's pretty neat.