Controls are simple.
ENTER starts the game and it also pauses a running game.
LEFT and RIGHT ARROW buttons control the left and right movement. Holding them down will shift it faster, however you should also be able to simply tap the buttons to move it more precisely.
UP ARROW will cause the piece to rotate clockwise.
DOWN ARROW will speed up the dropping until it hits either the bottom or another piece. With down arrow you can then move the piece or rotate the piece for about 1/4th of a second before it locks and a new piece spawns.
W will "hold" a piece for later. You can only hold one piece per spawn. If a piece is already in the hold, hitting W will place the current block in hold and spawn the previously held block.
The following controls are not required to play but make playing easier in the higher levels.
SPACE will cause a piece to drop down immediately and lock it.
SHIFT + LEFT or RIGHT ARROW will move the piece left or right immediately.
A will rotate the piece counterclockwise and D will rotate it clockwise.
Scoring is based upon three things:
(1) The more rows that you clear at once the more points you will get. Ex: Clearing 4 rows at once nets you more points than clearing two rows at once.
(2) Clearing 2 or more rows will earn you a multiplier. The multiplier is carried over and increased by clearing more lines in immediate succession. Dropping a piece without clearing a line resets the multiplier.
(3) Clearing the entire field earns you 4x your current multiplier.
The higher the level the faster the pieces drop. You earn levels by dropping 10 pieces or clearing lines.
The game ends when a spawning piece spawns upon blocks already on the field.