You can do this by setting the state of the game with a variable, whether it's global or private. Restrict the movements and actions based on what the variable says.
Okay,thanks alot!
Im going to try that, tho after reading some, i dont think construct is the most indicated software to build this game since multiplayer would become difficult on the long run i.e. lan/online game. But still im going to see what i can do.