Mineforgian
This is a quick mini-game where you must collect as many gold, diamond and emerald blocks as you can, from the pyramid, without dying. The pyramid is loaded with booby traps though, so beware...
Rules etc. can be found in game.
Forum Thread: http://www.minecraftforum.net/topic/1770905-15-pyramid-adventure/#entry21949799
Make sure you download the most recent file.