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Ace of Spades - Voxel based shooter
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Go here to download the game.
The wiki is here.
It was featured on rock paper shotgun too link
You can also find screenshots on that page.
The game play is basic capture the flag minus actually returning the flag(intel stays where it is and can only be moved by enemy). The terrain is fully destructible which allows many different tactics to be used.
The best part of all?
Its free. Yes, that means no cost and if you hate it you can return it for with full refund too!
Discuss,fair people!
Surplus