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Some options prevent you from obtaining achievements, they are marked with. This mode allows you to limit your current item, mutation, and outfit pool, enabling and disabling meta modifiers (such as amount of flask charges), adding starter items with varying qualities, adjusting the timer settings, et cetera.
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This game mode is available by absorbing the Customization Rune, obtained from killing a unique Elite Zombie at the start of Ramparts, but some configurations are available only by beating the game at harder difficulties. Custom Mode is an unlockable mode in Dead Cells, that allows you to adjust your runs as you see fit.
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