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Take a key, activate a switch, and exit the mine.

We assume we own a door in our level which should be unlocked with a key.

Here is your door. It needs a name in order to be scripted.

Just press the door button and enter a name for your door. Mine is "BlueDoor" :

You will unlock the door by taking a key.

Now you can lock the door BlueDoor at level start in the Dallas graphical script editor :

With the Object bar, choose and insert a key.

Ctrl+leftClick in 2D views to set the place where the key will be inserted.

Your key needs a name too. Mine is "BlueKey" :

With the script below, the player will take the key. In singleplayer, the key will disappear. In coop, it will respawn, but the key wont react when a player collide it a second time.

The door will be unlocked.

In this script, taking the key also completes a level goal :

The goal is set with the Goal window :

Dont forget to save your level after you set a goal when you intend to use the goal in scripts.

Enable your goals in the scripts :

Now your door is unlocked and you have access to a switch that will unlock your exit door.

This switch needs a name too. Mine is "ExitSwitch" :

In the Object bar, press the "info" button to see the number of animated frames for your switch.

Mine has 6 animated frames. Using this number, the switch will go back to initial position after its animation.

With the script below, the switch will be activated (only once) by the player and exit door will be unlocked :

But then? Maybe play an alarm siren and start a countdown?

You need a timer for this. Press the "User Types Workshop" button in the Dallas graphical script editor :

Selet "TimerID" and create a timer. Mine is "ExitTimer" :

With the script below, the count down will start (only once) when the player unlocks the exit door by hitting the switch :

Note : a timer needs and object. It can be any non-destroyable object. Here it is the switch itself, but it is not required.

The player has to exit the mine before the countdown is over :

Lets say exit the mine is a goal. A portal trigger may be used to see if the player reached the exit or not.

Select a  portal face, on the way to outside :

With the "Triggers" window, add a trigger to that portal and name it.

Mine is "ExitTrigger" :

With the script below, the goal "Exit the mine" will be completed when a player goes through the portal :

During the game, Shift+Tab will show the objectives you set in the goal window :

The guidebot will lead you to the objects you chose in the goal window for your goals :

Note : the guidebot wont be able to lead you as long as doors are still locked.