Ace of Spades is a fps/sandbox online game. You choose between the green or blue team and start a war about shooting and placing blocks to create shelters, bases, and rat tunnels.
You're after the enemy's intel: once you get it (by touching it) return it to your base. Once you get it, you can see the enemies on the map for 60 seconds. If you get killed, you'll lose it. You cannot move your own intel, but if you dig beneath it it will fall down (the same for your base). Every time you walk in your base, it will refill your ammo, health, and give you 50 blocks.
Source: The Game Website.