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"Lone Warrior" employs a fixed level of difficulty, which is quite understandable.
Dynamic difficulty is great, but it's not suitable for all games.
The reason "Walking with Darkness" can use dynamic difficulty is that its game mechanics are not strictly combat-oriented, but rather favor climbing, parkour, dodging zombies, puzzle-solving, and so on.
In these elements, there is a naturally huge difference between players.
When it comes to dodging zombies and solving puzzles, players with aptitude and those without might as well be playing two different games. Just like some players are naturally suited for stealth gameplay while others' idea of stealth is to eliminate all the enemies.
The difference in talent is also significant when it comes to climbing and parkour.
Some people are naturally athletic, daring to run and jump, and quickly adapt to complex parkour routes; but others, even in the virtual world, remain timid and lack physical coordination.