- %. united states Flappy Casino. The Independent Guide to the best paying online casinos. The promo-code ones can be redeemed in the “promo box” section of your online united states Sunplay Casino. Use the promo code 'planetspins' on Sign Up and make a minimum deposit There are a good number of ongoing promotions at The Sun Play casino. . 61 1 0 RSTR. Use the promo code 'planetspins' on Sign Up and make a minimum deposit of £ Wager a minimum £20 on slots and receive 50 Free Spins on. best sign up bonus online casino. We have tested, reviewed and ranked the highest paying online casinos in the UK for.