Thanks for your answers, you are very kind.
Pixel perfick, in Event Sheet I added:
Mouse - On Left Button Clicked - Bullet - Set Angle to 270 degrees.
Mouse - On Left Button Clicked - Bullet - Set Bullet angle of motion to 270 degrees
Now this shoot UP <img src="smileys/smiley1.gif" border="0" align="middle" />, but my bullet has rotated also those grades <img src="smileys/smiley19.gif" border="0" align="middle" />
I have checked on the properties bar to have rotate to angle unchecked and checked, but do not understand why it happens.
These images are the ones I've tried, I'm sure there is something wrong:
<img src="http://oi37.tinypic.com/9qd74y.jpg" border="0" />
<img src="http://oi37.tinypic.com/2dj89jm.jpg" border="0" />