Press I to open and close Inventory. Press the red X button in the inventory to turn on remove mode, then close the inventory and remove blocks! Press any item in the inventory to turn on modes of other blocks, and place them where air would be, (use the arrows to go left and right in the inventory) Press B to use something (food, bed, nuclear reactor)
Stuff added in this update: Terrain Generation Changed a Bit New Blocks Underground: Marble Tuff Calcite Amethyst Mixing Update: Iron cools (mixes with water) to Iron Block