Prior to being picked up by Jagex and released to a wider audience on Steam, Ace of Spades had an alpha build that was available as a free download. While both versions carry the same name, it was the earlier Ace of Spades with its trench warfare that players seemed to prefer. Now, the new game -- the commercial one on Steam -- is getting a free Classic Mode as DLC:

• Classic Specific Class: Deuce Character Class – An updated version of the single character class which featured in the Classic version of the game.
• New Maps: 5 new battle maps including a community created map.
• Traditional Gameplay: In a nostalgic nod to the original game, the Classic Mode DLC brings back classic game modes and the trench warfare theme. 
• New Strategy Focus: Slower gameplay and maneuverability gives tactical strategists a chance to shine and beat their opponents into submission.

This content is supposed to drop today, so if you happen to own AoS already, perhaps it'll be worth it to check back in. I'm somewhat worried that fans of the alpha will feel this isn't enough, since that's how these situations have gone down in the past despite best efforts, but I do love that a) they're trying and b) it's free.