Bonus poker is based on the five card draw variation of regular poker. It is also very similar to the video poker Jacks or Better. In this game the main difference is going to be the payouts. In Bonus Poker you have a better payout than in Jacks or Better.
First in Bonus poker you are dealt five cards after you make your bet. The bet should be the max bet that you can make in order to get the highest payouts. Once you have the five cards you can choose which cards to hold on to. The idea is to hold on to the better cards. It pays to know the pay tables in this game. For example the Royal Flush or Four of a Kind are going to offer the best payouts. For the Royal flush you could earn 250 coins on a one coin wager and up to 4000 coins on a 5 coin wager.
The best thing you can hold on is if you have four cards that could lead to a royal. If you have 3 cards to a four of a kind you should hold on those cards. The cards you hold on will help you get to the winning hand.