At the end of August, we brought you Mari0, which showed everyone how our favorite plumber would navigate the standard World 1-1 with aid of Portal gun. It was pretty friggin' easy.
Now the mod's developers are back to show us Mari0 as an actually challenging video game, applying Portal's unique puzzle dynamic to the classic platformer.
Since this video went up to YouTube the Mari0 modders have shown off examples of how speed and bouncy gel work in the game with dispensers. Go run check it out.