When the speed increases, many beginners panic and misplace blocks. Take a deep breath. Remember that you can always soft-drop (down arrow) to speed up a piece without committing instantly. Focus on a small area—the bottom 3-4 rows—and make quick, decisive moves.
The you want to tie it to (e.g., geometry, basic computer skills).
Try to keep a gap on one side (usually the far right) to stack four lines high. Use the long, straight piece (I-piece) to clear four lines at once, which awards the maximum points.
Tetris can be a stressful game, especially as the speed increases. Try to stay calm and focused, even when the blocks are falling quickly. If you feel yourself getting frustrated, take a break and come back later. A clear mind will help you make better decisions and play more effectively.