His guy randomly walks when he right clicks the block where he wants to go . Plz can u fix this i really wnat him to play

And can you plz fix the fullscreen

Fullscreen will be fixed in the much later version.

As for your friend's problem - I can't really fix it untill I see it my self.

Maybe he's using fullscreen too, and that causes problems?

Also let him try clicking the cells that are right next to him, and tell me if his char does go there.