The level of challenge in the game, as determined by the relative ease of the gameplay.
Some players enjoy exciting challenges and will stand firm even in the harshest of defeats. Some players lose enjoyment when a game is too difficult, while others lose enjoyment when it is not difficult enough. The breadth of skill levels and preferences presents a very wide variety of strategies on how to approach difficulty.
Difficulty comes whether or not there are separate levels of difficulty in the game, as well as whether or not the challenge level is directly configured by the player. Use this tag when you have concerns about the difficulty of your game, with topics such as the differences between difficulty levels, what triggers or performance to use when scaling difficulty, or how to balance the difficulty so that it never gets too hard.