Both Luxor games feature two modes of gameplay--an adventure mode where you compete in a series of increasingly difficult levels and a continuous play mode where you keep battling marble-pushing beetles in unlocked stages until you're overtaken by marble madness. The varied gameplay keeps things fresh, and the fact that you can stop and start Luxor at will--the game will save your progress--makes it an ideal casual game when you need to take a break. Both Luxor HD and Luxor: Amun Rising HD will appeal to fans of the original game, while probably earning new converts to the franchise. And with both games marked down by 90 percent as I write this review, there's never been a better time to download either game.