To start off with we will want to create the numbers, select the front faces of each piece and select a bright texture (i recommend lights/white001) select all the pieces and change them all to func_wall.
name each individual piece, this is what i named mine:




Next we will work on making the number 8, this will be easy all we have to do is copy all the outputs we created for the number 9 and change second12 so that it is red aswell and you will have a number 8, make sure instead of a delay of 1 second there is a delay of 2 seconds instead so for the first second you get the number 9 and the second a number 8:
If you were to run the map this time after 11 seconds you would get a number 9 and then 1 second after that the number 8.
Now to make a number 7 we will have to remove the light from second8, second11, second12 and second13 like this:

When you have finished adding the numbers 9 to 0 you are finished with the logic_timer, don't forget to change it back to start disabled if you were running the map for tests.
What you will do now is make a func_button, set it up so the delay before reset is greater than 60 seconds if you want the countdown to be used more than 1 time, copy and paste all the outputs you put into your logic_timer into the outputs for the button and change them a little bit make it so these ones work on pressed instead of ontimer, also make it so on pressed the logic_timer is enabled with no delay, the reason you need to copy all the work you did in logic_timer over to here is because for the first 10 seconds after the logic_timer is enabled it won't do anything, there needs to be a 10 second delay so it does its count from 9 to 0 so in order to make up for the first 10 seconds not being displayed they have to be added to the button so they work instantly 1 time.
Now we will work on the left side of the digital countdown, there is no point of making a second logic_timer for these as these numbers will only be displayed 1 time so we will add them to the func_button, make the number 5 and don't forget that now you are working on second1 to second7 and not second8 to second14.

Finally, make an output for the button which makes it so that after 60 seconds of being pressed the logic_timer is disabled.
And thats it! You have created a countdown timer which counts down from 1 minute.
- NAPREDATOR