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This is quite simple actually. You have your fireball object. I'm going to hope you know how to create it at the right time.
Every 00'07- +Add 1 to Alt. Value A
Fireball collides with backdrop +Set Alt. Value A = -10
Always +Set Fireball Y Position = Y("Fireball") + Alt Val A("Fireball")
To add gravity, do this: When you launch the fireball, set alterable value B to -10. Change the Colliding with Backdrop event to:
Fireball collides with backdrop +Set Alt. Value A = Alt. Value B +Add 2 to Alt. Value B
Hope this helps! By the way, you may want to screw with the numbers a bit.
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