Ace of Spades: Battle Builder

Ace of Spades is a Minecraftesque first-person shooter that runs around creativity and destruction of your own creations. First, you're set to create your own map out of voxel-based structures. You can do that alone or with the help of your friends. You can invite up to 23 friends to help you out. After that, the real fun begins as you start the match and destroy opponents and whereabouts with any weaponry available. You can share any of your creations via Steam Workshop. Multiplayer modes allow a maximum of 32 players to be around. These and steam achievements make this game somewhat interesting to kill a spare time to.