8 terminate after <n> frames
11 terminate after <t> milliseconds
14 terminate after n frames, assume <t> milliseconds pass each frame
20 Move around with WSAD, shift, and space, look around with mouse motion.
21 Mouse button 1 deletes the block you're pointing at, button 2 selects it
22 as the active block, and button 3 places the active block next to the one
25 As an alternative to picking, you can also use the mousewheel up/down to
26 flip through available blocks.
28 Q changes the face of the active block (loops over up, down, right, left,
29 front, and back) and E changes the turn (none, left, around, and right).
31 Pressing B prints details about the block you're pointing at and P prints
32 info about the active block.