In Mario Kart the game for Nitendo, you get something called a green shell which if you press a button it shoots it out to hit a wall and bounce of and keep on doing that...
Can someone help me with that trigger
That'd be kinda hard to do. However, you could make a trigger that sends the unit out of the Location over the players 'kart'. Then, when it shoots, have it go to a location on the side (the wall) and have it bounce over to another location on the other side.
This is a very complex trigger system, especially since multiple objects will come into play. You might have to think of some way to work around it or try something else, because I'm lucky if I even undertook something like this for one of my own maps.

Actually, are you saying that it automaticly shoots off towards the nearest wall, or goes straight until it hits a wall?
If it automaticly goes towards the wall when you first shoot it, it would be fairly easy.
Just make it move towards the nearest wall, and "bounce" to its opposite location.
No, in MarioKart it shoots in the direction you're facing. Then it bounces off the wall at the correct angle.
I can think of a system, Do you want me to put it into a map? I don't know if it will work though, BRB i'm going to try it.
NVM it would take too long.
I modded my Coordinates Map to do that once. I also conceptuallized a bullet version with Dabbu witch would probolly be more conveniant.
However honestly, unless you dumb it down alot then this is way over your head.
Lol thanks for the help but my friend helped me out
Check it out, I already added the file, its probally in Queed right now
All I could think of IS put a location around an observer, than when you shoot the turtle shell archons expode following the oberserver's path. But to bounce off the wall... The only way I can think of doing this is making a lot of locations on the wall it hits (put an zergling targetign system at the opposite wall) and doing a seperate trigger for each location..

Although, you could just put flags or somethign as the walls than whenever the observer runs into it, THe observer dissapears. Hense, the turtle shell hits the wall and breaks.