How to make a timer in Scratch using a variable
One way to add an element of challenge to even the simplest of games is to add a time limit. A countdown on-screen and a rising sound effect can help to heighten the tension. My 10-block demo below does all of this for you. You can add it to any game to add a 30 second time limit, and can adjust the time limit to any number you want.
You can put this script on any sprite or on the background. If your sprite already has other scripts on it, add the timer script as an additional script on the sprite. Don't try to combine them, otherwise you're likely to slow your game down because of the 1 second wait in the loop here.
How my Scratch timer demo works
- You create a variable called timer. You need this to be able to show the countdown on the screen. I set the timer value to 30. You can make it shorter or longer.
- The loop waits one second and subtracts 1 from the timer value. The number of times the loop repeats is decided by the initial value of the timer.
- Each time around the loop, it plays a sound effect. The note is 60-timer, which means it gets higher each time around the loop.
- When the time runs out, the stop all block is used to end the game. All the scripts on all the sprites are stopped by this.
See it in action
You can see my Scratch timer demo below. I added a moving cat, just so you can confirm that the script stops when the timer reaches zero.