Incremental reveal has now been added to Google presentations to gradually reveal a selected object on your slide.
How to access what’s new:
– When editing your slide, select an object that you want to control and right click on that object. In the drop down menu, select incremental reveal. You’ll then see a stopwatch icon on the object.
– When you add incremental reveal to more than one object on the slide, the stopwatch icon changes to display a number, representing the order in which that object will appear on the slide. To change the order of appearance for objects, right-click on the stopwatch. A drop down will appear with a list of numbers. Select the number for the order you’d like that object to appear.
For more information: