>>536452635
Games can be good tools for teaching the simplified basics of certain fields in a very intuitive and simple way. (The prime example is of course KSP and orbital mechanics.) Enough to form an intuitive grasp of the fundamentals that can aid in further learning of practical applicable knowledge. But you have to be acively wary of what you learn from games; understand which parts are valuable and which are downright misleading bs or white lies for children at best.
But increasing one's knowledge is different from increasing one's intellect. Games don't make one smarter unless he already has a curious mind which applies to all of his pursuits.