[GM] How do you make people die?

At the moment when the player falls he just... falls, How do I make him die and have to start at the begining of the level?

look through the tabs for actions, there is one that is restart the game, and there is one that restarts the level. remember to set his lives to -1.  relative.

Bio, your jumping ahead of him... He never said he had a lives system set in place.

What you want to do is make an event for the object for outside the room. In that event, tell it to restart to room. (that's the button with the picture of a green arrow going up into a room)

OHHHHHH I thought he meant falls as in dies, not falls as in falls off the screen.

Thanks, so how do I get a life system? 

There is a button for health, and for a healthbar (although the bar is a little lame, and can use some working out) and in the same tab there is also one for lives.  Just go down the tabs, you should see one.