To get started with this extension, follow these simple steps: Omit the timer tag altogether or omit the -+ in the timer tag to Auto Advance Your Google Slides Only on the ones you wish to advance to the next slide. You do NOT need to auto advance your Google Slides for each slide. your presentation and this will also start the timer if you have the timer tag on the slide. The countdown timer only works when you are in presentation mode. Slides Timer is FREE! If you like it please consider buying Clay a coffee to say thank you! Presentation Mode > will countdown from 2 minutes and upon expiring auto advance to the next slide. To auto advance your Google Slides you will need to add a minus to indicate countdown and a plus to indicate go to the next slide.