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: Collectable Items: If there are 99 or less, it displays the number, If there are more than 99, it displays 99+, If there are infinite, it doesn't display anything at all. Nuclear Reactor, (using it destroys the whole world!) Burning Update: Sand burns to Glass Clay burns to Bricks Iron Nuggets burns to Iron