Crossblock, logic flash game for your brain

It's time to train your brain with logic games!

Today I present you Crossblock: the goal of this flash game is to cross out all the squares.
You have to click and drag to draw a line (horizontal or vertical, in the same line) over X squares. The number X increases with levels.

You have 50 levels, I stopped at 47th.

To begin to play, click HERE.