What are the best Sandbox games on PC?

Minecraft is an indie sandbox video game based around building structures in a voxel based world. There is a survival mode as well as a free play build mode. The survival mode features a world where on must survive creatures that try to attack the player and come out in force at night so it is the player job to try and build a shelterContained within is a survival mode, as well as mine and collect items that will allow them to survive as long as they can. Through mining and collecting materials tha free player will be able to build better structures as well as better weapons and armor to use to defeat the monsters that are scattered around the world.