Unlock bonus maps:To unlock new bonus maps, finish the indicated mission and earn gold medal:Best Defence: Finish mission 17 with a gold medal.Check Mate: Finish mission 8 with a gold medal.Construction Junction: Finish mission 6 with a gold medal.Monkey Troop: Finish mission 5 with a gold medal.The Blue Dragon: Finish mission 13 with a gold medal.The Great Wall Brawl: Finish mission 11 with a gold medal.The Question Of Faith: Finish mission 19 with a gold medal.The Ship Of Fools: Finish mission 14 with a gold medal.Tower Of Power: Finish mission 16 with a gold medal.Under Construction: Finish mission 3 with a gold medal.Unlock Centurion Helm and flags:Finish all the tutorials with a gold medal to get access to Centurion Helm and flags.