Garry's Mod really doesn't get enough attention. Months of entertainment that is constantly being updated by the community to expand the games past it's already incredibly huge level of freedom and diversity for a mere 10 dollars. In most games lets say you were confronted with a zombie. Your usual choices would be shoot it, beat it with a blunt object, or ignore it. In Garry's Mod you can: kill it, throw it across the map, put it in a race car, tie it to a rocket headed for the moon, befriend it, use it's body as a weapon to beat other zombies, build it a house, put it in a musical, or expand it to Godzilla size and build it a city full of NPC's for it to terrorize. The possibilities are only limited by the ingenuity of the community.