Free spins increase separately for each stake level as you collect diamonds on reel 5.Here is a quick summary, with the full write-up below: The reels are a different shape, and the diamonds add an element of strategy. Buffalo Diamond is most similar to the Buffalo Grand games, in terms of game-play and features. If you have ever played the Harley Davison slots, then you’ll be familiar with this idea. This combines a lot of familiar features with a new progressive way to up your free spins count. There was one slot which really had heads turning at the Aristocrat booth at the G2E gaming expo – a brand new addition to the Buffalo slots family called Buffalo Diamond. Review of the All-New Buffalo Diamond Slots: How to Win Big!