Keys to use:
- Left arrow: move block to left
- Right arrow: move block to right
- Up arrow: rotate block
- Down arrow: let the block fall faster
- Space: drop block
- p: pauses the game
The game shows you a small image of the next block. You can think ahead and plan where that block may be placed. If you are seeking a highscore (who isn't?), try to remove several rows at once. That will give you higher scores. And of course, practice.
If the game does not respond to keypresses, try clicking on it with the mouse and try again.