This game template was design for students with zero experience. So the create new objects command was omitted in the user defined rules. The game itself controls the box placement for this game. The goal of that game was to learn about events and actions.

I plan to add more game templates with the create object command for more advanced users. You can set it's properties, game physic values and so on. The game itself will need to implement and execute that command. The game template just tells the Game Creator what that current game supports. So the magic happens in the game code. Hit view source on the game if want to see it.

The project was built in a 2 weeks; server, Alexa integration, mini-game, and game creator logic. If the project gets any traction, I'd love to keep working on it.