If the success of Flappy Bird has taught us anything, its this: difficult games are NOT niche. Rewards taste sweeter when the effort required is greater, so it should be no surprise that difficult games are often more rewarding when you win. When was the last time you basked in the glory of hard-fought victory? Nowadays, difficult games are rare. Difficult games that are fun? Even rarer. But thanks to Steam, you can play these games without spending too much money. In terms of the ratio of price-to-glory, these games are the best value youll ever get. Are you ready...