hi there
I also came from GM and I think he meant that GM had some very useful functions, which I used a lot:
- position_meeting(x,y,obj) - which returned if an object (actor for stencyl) is at position x,y. I still didn't figure out how to do this in Stencyl, and I used this function a lot in my GM games, and now I find it hard to remake them in Stencyl.
- position_destroy(x,y) - which destroys every actor with mask in x,y - very useful and want it in Stencyl

- place_free(x,y) - which checked if x,y has no actors there, excluding sensors.
- place_empty(x,y) - same as above, but checking sensors also.
About the while, for, and the rest of the loops I figured them in Stencyl with <repeat until> block. Still it could be easier with a for loop

And while I can use the <repeat n times> for a single <for>, for a <for> in <for> it didn't work for me....
Hope it is clear now
