Algodoo

Oh, and I forgot to tell you how to control it. RIGHT and LEFT to move the car,
UP and DOWN to move the cannon and ENTER to shot.
But first you must delete Fixate points at the left down corner of the gun.

no steal the work of a person.
but aniway, when you copy a "thing" of other scene, if the other scene contains a cript to work, will reset the "thing" parts ?
example :
you make a laser, if the laser hit on whataever then a lenght of a spring will be : 20 else will be 2;
if you copy and paste in other scene
the scale, the paremeters and the functionality will not works correctly
now you understand ?
in the script menu, in tabe lenght the variable not will exist, because in the scene you paste the variable is undefined

You may not fixated on one object in two places using (Geometria Actions> glue together), I think that's the thing.
Sorry my English!