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Hard mode single player, no crosshair.
External link →Hard mode single player, no crosshair.
External link →For single-player, you can customize your difficulty settings by clicking the "Advanced" button located to the right of the preset difficulty selection button. In this scenario, that means it's next to the button that says "Hard".
Difficulty customization applies per-difficulty. This means that you need to have Hard mode selected, and then customize your difficulty settings.