VL-Tone, the sole creator at Qubed Studios, has recreated the full metroid game in 3d. It's called Metroid Cubed and it's great stuff for fans of the classic free-form exploration game. In his updated version, you can warp to any place on the map, and can change all sorts of things such as lighting and backgrounds and even play sans armor.

He's also got some other great voxel experiments and a Mario64 editor on the site as well.

Click and check it out: Metroid Cubed