Minecraft
A game where everything is made of 1 meter cubed blocks.
There are 4 modes:

Survival: Gather resources, build a house, fight health and hunger, kill the Ender Dragon.
Adventure: Same as Survival but you can't destroy blocks.
Hardcore: Survival with no respawning
Creative: Build anything with unlimited resources, free flying, and no health or hunger.
Minecraft is awesome
Current version: 1.3.2
The new 1.4 update in Minecraft will have leather armor and wolf collars that can be dyed, cobblestone walls, item frames, new potions, carrots and golden carrots along with potatoes and baked potatoes, beacons, zombie villagers, bats, witches and more!!