cool, thanks for the code

I tried it but it doesn't seem to work at first sed gave me an error so I changed "time_step" to "time" like you told me and it worked.
I then made the arrow model and a model for the arrow creator.
I placed the mdl of the arrow creator on my wed game and gave it the action arrow_creator then I build and when I runned all that happened was that the arrow creator exist but is invisible (that's ok because I would like that) but I first see two arrows flying towards a direction and two arrows stuck where the arrow creator.mdl is and no arrows being created or moving.

I would like this to work because I would like to make these obstacles and in a later level big rocks rolling towards me, but if not that's ok because I can place something else and eventually figure it out.