Action buttons are icons that appears when you click on an object. This can help you to choose what do you want to do with the object and there are many interaction options.
Scribblenauts[]
Super Scribblenauts[]
These are the GUI buttons in Super Scribblenauts.
Scribblenauts Remix[]
Scribblenauts Unlimited[]
These are the GUI buttons in Scribblenauts Unlimited.