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Osu! Hacks - How they all work, and how to catch them. - Reddit

Slightly adjusts cursor movement to ensure you hit circles even if your aim is slightly off.

Often includes settings for "humanization," adding random delays to taps to avoid detection by automated systems. Important Warning

Slows down the game's internal clock, making difficult patterns easier to read while the resulting replay appears at normal speed.

The osu! anti-cheat system and community tools like Circleguard can detect the inhuman accuracy and timing patterns these tools produce.