How can i make a reload button which can restore the game to the latest score after watching an ad?

Hi Everyone!.
I want to make a button for my game which will do the next thing:The button will reload the game at the last state(latest score,player position before i failed the level),only if i watch an video ad.
An example would be crossy road game.
How can i do this?

Welcome!

What do you have so far? Do you have your basic gameplay working and an ad system integrated?

Hi!
I have the game ready…its just need some polish.I want to earn some money from my game and in order to do that i want to use some ads.