This is a pretty straight up example on how to create a random action with a certain probability to it. It's pretty straight-up and easy but helpful. It's for anyone, but especially as an example for Miniwolfen
All the information is located in the scenes as text and when you branch it in comments in the behavior section of the text called "logic." This can be used for anything from free daily coins in a game, to effects that really make a player feel good about themselves.
If you want me to create any other harder tutorials on saving or whatever else just let me know in the comments. I'm glad to help!