A few months ago, I downloaded a mobile game called "DomiNations". This game is similar to the "Age of Empires", in which you develop your civilisation and lead it through different ages. Besides developing buildings, you could also lead an army to attack and loot other players. Likewise, you could also be attacked by others. To master the game, I tried to search online for an official game manual which could describe the strengths and weaknesses of different buildings and army units, as well as how to place the buildings for the best defence. Unfortunately, I could not find a good game manual, much less an official one. It is like the stock market, isn't it, which does not come with an official game manual. It does not teach you what stocks to buy, when to buy and when to sell. Although this void is ......