Learn how to make or create a Countdown Timer in PowerPoint. You can also use an Add-in. Displaying a countdown timer in your PPT can be helpful in many ways.

How to add more Guides to the PowerPoint slide To add more Guides to your slide, place your cursor on the Guide, press Ctrl, then click and drag the Guide, and you will see another Guide.

One way to do this is by adding snow to a PowerPoint slide. The article How to make it snow in PowerPoint offers a basic snow plan that uses the same shape and random timing effects.