Sorry about the wrong location.
Do you know of any good tutorials or starting points for dialogs?
What I was thinking was:
10 Buttons ( 1-0 )
6 buttons are required for passcode.
Each time one of the 6 is pressed, game_logic sets the objectives to DONE, once all 6 are done, it causes a trigger to start the vehicles engine.
If a wrong button is pressed, you are ejected from the vehicle, the objectives are set to fail, and you must wait 10 seconds until its unlocked to try again.
Pretty easy if you think about it, just never done dialog buttons before.