You can get promo codes on our official Facebook page: www.facebook.com/KlondikeAdventuresGame 

Promo codes give you prizes once verified: energy, resources, tools, boosters, etc. To verify a promo code, you need to open the first promo code link: it will lead you straight to the game, and you'll be able to receive your prize! If that link doesn't work, there is a second one below it. You can open it and type your ID in a special menu to get the same gifts.