I have a question. How to restart the whole game?
Manually delete and re-install it
also, this is the "Suggestions" topic. Here you should frame this as a suggestion for a "NUKE" button that deletes all data similary to the "delete mission data/delete mission map" buttons with a question on the side.
But a "NUKE" button would be a great idea.
And before you say something about these being the only topics and no other topics for which you to ask your question, just make your own topic.
go to local appdata and deleted the Sand_alpha folder there. I'll add a button to restart the game soon.