I played a lot of mahjong games over the years before I found the two from Kristanix -- and now I've pretty much stopped playing anything else. These games are so beautiful, so relaxing, and so addictive that I've spent eight months solving the 3300 boards they offer (plus the new daily games!), and I may just start all over again. And the customizability is nearly endless.Honestly, I prefer this one to its sister game. While the only noticeable difference is that Titan is in portrait mode and Epic is in landscape -- so it's just a matter of tilting the iPad sideways to play one or the others -- I've actually solved all 1650 boards available in Titan, but there's one in Epic I'm convinced is unsolvable. :}Get these, and then pay for the upgrades. They're the best free apps I've ever played, but it's worth throwing a few bucks at the developers for such spectacularly well-designed games! (And no, I don't know any of the developers. I'm just a very happy player.)