- %. best sign up bonus online casino. The Independent Guide to the best paying online casinos. . united states Flappy 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. 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. We have tested, reviewed and ranked the highest paying online casinos in the UK for. The promo-code ones can be redeemed in the “promo box” section of your online united states Sunplay Casino. 61 1 0 RSTR.