Absolution has five difficulty levels. They are:
Easy
Players can activate additional checkpoints.
Instinct regenerates.
Instinct will provide hints.
Enemies react very slowly.
Normal
Players can activate additional checkpoints.
Instinct does not regenerate.
Instinct will provide hints.
Normal enemy presence with normal reaction times.
Hard
Players can activate additional checkpoints.
Instinct depletes when used and does not regenerate.
No Instinct hints.
Additional enemies with improved reaction times.
Expert
No player-activated checkpoints.
Instinct depletes when used and does not regenerate.
No Instinct hints.
Maximum number of enemies with fastest reaction times.
Purist (see above).
Difficulty changes will also provide extra score multipliers. The harder the difficulty, the bigger the multiplier is.