can someone help me with a countdown timer?

I want to make a timer that counts down and once it hits zero the game ends

1. First page of the events page, use Control Timer: Start. Set the time to whatever amount you need.

2. Now you need a persistent check that will pass when the timer reaches 0. Still on Page 1 of the event, turn on a Self Switch.

3. On Page 2 of the same event, set the event trigger to Parallel Process. Use a Conditional Branch event command. From the Conditional Branch options, Check the Timer bullet from the first page, set the values at 0, and select "or Less" from the drop down box.

4. Inside the Conditional Branch, place a Game Over event command.

Reference image:

http://i.imgur.com/OmfpEiM.png