Gameplay
From Minepedia - The Minecraft Wiki!
Gameplay in Minecraft consists mainly of adding and destroying blocks on a map surrounded by water on all sides. There are several different types of blocks, some of which perform special functions like spreading or falling down because of gravity.
With these blocks, players create large constructions such as castles, roads, buildings and skywalks, along with forms of artwork. A chessboard or giant picture rarely goes amiss on a server. Not only have users designed buildings, art, and caves, but also mini-sports. Using the current in-game features, users have put them to clever use. An example of a Minecraft sport is Spleef.
Notch has added a Survival mode, and is planning on adding Zombie Siege and other modes to give Minecraft more gameplay. Minecraft is currently considered purely a sandbox construction game. Users who have bought the game can access to the in-development version, or indev. This version can and has contained bugs, but features the most recent work on Minecraft, including dynamic lighting, crafting, farming, new blocks, and a more configurable map generator.
