Astro pop is a case where the tired gaming cliche "unique twist" most definitely applies. The pop of astronomy successfully hybridizes top-down shooters and puzzle matching; creating a blend of addictive game play quite unlike the myriad of Zuma/Luxor clones you'll find on competing casual game portals. It also earns the dubious distinction of being one of the few 360 Live arcade titles worth shelling out MS points for and is $11 cheaper than the PC equivalent. 4 unique unlockable astro pilots make it worth playing through multiple times though it bears mentioning that there is no online head to head multiplayer. But hey if you're a 360 and or PC leaderboard whore more power to you ;)