Minecraft is an earthy version of the virtual world that we all know and love. There are many versions of the game available for download across the different websites, but the one you want to get is the 'Minecraft Lovehunt' version which is the latest one.
It's more of a role playing type game (like World of Warcraft or EverQuest) where you basically go into a 'virtual world' to do battle and gather materials and build structures to progress through the game. Minecraft Lovehunt is an online free download puzzle game based on the highly popular sandbox game that the two creators, Mojang and Zynga, have created.