To score, align 3 or more blocks of the same color adjacent to one another on a row or column.
Each time you score earns points, and increases your point multiplier. However, the point multiplier resets every time a new block drops, so try to score as many times as you can off a single block.
After every score, all unsupported blocks will fall until they land on something. Use this to your advantage to build up score chains, and boost your multiplier.
Move left:
A or left arrow
Move right:
D or right arrow
Quick Fall:
S or down arrow
Rotate Left:
Z, Comma, Up, or W
Rotate Right:
X or Period
Pause:
Esc, Space, or Enter