If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you will never win, all you can do is survive for as long as you can!
You control a little block at the bottom of the screen; pressing "space" you add new block at the top; when a row is completed, it is destroyed. To stay alive you must have good reflexis and speed; good luck!
p.s. don't even try the easy difficulty: it's only for noobs! :-)
Move the hero at the bottom of the screen with LEFT and RIGHT arrows keys; shot a block with SPACE;
when a row of blocks is completed, it is destroyed;
the aim of the game is to survive as long as you can;