There's Airmech, an alpha version is available for play on Google Chrome. I think the developers intend to make it into a free2play game, like Leagues of Legend.
At least Mandarin grammar is relatively simple, and it has only 4-5 tones compared to Cantonese or Minnanese. But don't get me started on the multitude of Chinese dialects.
The point about classical Chinese isn't fair, the language itself has evolved little in the past few thousand years. To achieve the same utility in English, you will have to learn Modern English, Middle English, Norman, Old Saxon, Latin etc.