Everything gone in scene

The scene above certainly seems empty. Look around for other scenes to make sure that’s really the one you were editing. You definintely MUST manually save scenes by pressing Ctrl-S regularly.

Remember, if you make changes while the game is running, then stop the editor, ALL those changes are gone. This is by design and can be read about in the docs.

Whenever you are using a computer to do work, it’s always a good idea to make backups.

For development, source control is always the best, plus it also lets you share code:

Here’s how I use git in one of my games, Jetpack Kurt: