升级Sub是一款技能游戏。您可以在浏览器中免费播放升级子。这个游戏需要耐心，但坚持下去。您从令人难以置信的虚弱开始，会立即死亡，但是由于大量的货币流，您将很快能够升级您的潜艇！
Enable Flash in Chrome settings. When Flash is disabled, the label will read " Block sites from running Flash ".Click the toggle to enable flash and the label will read " Ask First ". Shown like the following:
Now Click And then,click " Allow " in the box that appears in the top-left to play the game.Shown like the following:
