I am making a game and I want text to appear when the character enters a invisible cube. I have tried to make a overlay scene, but I can't make it work. Thanks!
There are plenty of ways to achieve this.
Your scene idea could be implemented as follows:
Collision sensor (filter for a property the character has) AND controller Scene Actuator Add Overlay -> your scene with text
- ensure the camera of the overlay scene is showing something
- ensure your character can be detected (static objects are not detected!). In doubt enable Game/Show physics Visualization.