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To solve the Enigma Codes, head into the extras menu and then into the Enigma Codes section.
Enigma Code #1 Solution

01 02 03 04 05 06 07 08 09

08 07 06 05 04 03 02 01 09

Enigma Code #1 Unlocks 999 Mode, which allows you to play with “999% more action”. You’ll start with 999 health, unlimited ammo, and UBER difficulty.
Enigma Code #2 Solution

02 04 06 08 01 03 05 07 09

07 05 03 01 08 06 04 02 09

Enigma Code #2 Unlocks Walk in the Park Mode. This disables all HUD elements except for interactive prompts. You’ll need to rely on your senses to survive on I AM DEATH INCARNATE difficulty.
Engima Code #3 Solution

03 06 09 03 06 09 03 06 09

06 03 09 06 03 09 06 03 09

Enigma Code #3 Unlocks Hardcore Mode. Hardcore Mode removes all health and armor pickups from the game, and is played on UBER difficulty.
Enigma Code #4 Solution

04 08 03 07 02 06 01 05 09

05 01 06 02 07 03 08 04 09

Enigma Code #4 Unlocks Ironman Mode. Ironman Mode gives you only one life, game is over if you die. Played on UBER Difficulty.