The 72 fragments and the 4 codes
Four codes, 72 fragments, eighteen per secret. Enter the two rows of digits in the Extras menu. They unlock 999, Walk in the Park, Hardcore and Ironman.
There are 72 enigma code fragments in The New Order, eighteen per secret, and four secrets to crack. Each one unlocks a bonus mode that changes how the game plays. This page has the puzzle logic, the chapter counts, and the four solved codes.

Where the 72 fragments are
Fragments are red booklets marked "GEHEIM - Enigma Codes" with a black Wolfenstein logo. Most sit in the open. Some are behind hidden routes, and a few only appear if you interact with the right object.
| Chapter | Fragments | Chapter name |
|---|---|---|
| 1 | 7 | Deathshead's Compound |
| 2 | 1 | Asylum |
| 3 | 7 | A New World |
| 4 | 6 | Eisenwald Prison |
| 5 | 0 | A New Home |
| 6 | 8 | London Nautica |
| 7 | 0 | A Mystery |
| 8 | 8 | Camp Belica |
| 9 | 0 | New Tactics |
| 10 | 8 | Berlin Catacombs |
| 11 | 5 | U-Boat |
| 12 | 8 | Gibraltar Bridge |
| 13 | 6 | Lunar Base |
| 14 | 5 | Return to London Nautica |
| 15 | 0 | Under Attack |
| 16 | 3 | Return to Deathshead's Compound |
Each fragment is labelled row and column, like "3:2". Multiply the row by the column. If the result is above 9, add its digits together until you get one digit. That number is the cell's value.
The four solved codes
Enter these in the Extras menu on the title screen. Two rows of nine digits each.
Code 1 - 999 Mode
Row 1: 08,07,06,05,04,03,02,01,09 Row 2: 01,02,03,04,05,06,07,08,09
Gives 999% more action, 999 starting health, unlimited ammo, and plays on UBER.
Code 2 - Walk in the Park
Row 1: 07,05,03,01,08,06,04,02,09 Row 2: 02,04,06,08,01,03,05,07,09
Removes every HUD element except interaction prompts. You play on I Am Death Incarnate with no interface.
Code 3 - Hardcore
Row 1: 06,03,09,06,03,09,06,03,09 Row 2: 03,06,09,03,06,09,03,06,09
Removes all health packs and armour pickups from the game. Plays on UBER.
Code 4 - Ironman
Row 1: 05,01,06,02,07,03,08,04,09 Row 2: 04,08,03,07,02,06,01,05,09
One life. Die and the run is over. Plays on UBER.
What these modes do to your perks
Nothing good. Extra modes disable perk progression and collectible tracking entirely, so a 999 run is for fun and for the mode-specific achievements, not for filling your perk board.
If you are chasing 100%, finish the campaign first, then replay with codes.
Checking a code before you commit
The Extras screen shows both rows as you fill them. A wrong digit leaves the row unfinished rather than failing silently, and you can back out without losing the fragments you have already found.
Fragments themselves are saved the moment you pick them up, not at the next checkpoint, so a death after grabbing one does not cost you the pickup.
The two easy mistakes
The first is hunting fragments before you have Scout II. That perk puts commanders on your map, and stealth-killing a commander marks nearby collectibles with a question mark. Get it in the prologue and the rest of the game becomes a checklist.
The second is assuming the puzzle needs lateral thinking. It does not. It is multiplication and digit summing, and the four answers above are the four answers.
The perk guide covers Scout II and the rest of the stealth tree, and the collectibles page covers where fragments sit relative to everything else worth picking up.