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What do the letters and digits in a problem code such as C64 41N R mean?
Several players agree on the first two characters, and nobody has documented the rest.
- CodenameGreyFox · Community · 2023-01-09
- poptasticboy · Community · 2023-11-07
The first letter sets the mode and difficulty: A to C are Classic easy, standard and hard; D to F are Extreme; G to I are Nightmare. The digit after it gives the number of verifiers, 4, 5 or 6. The rest of the code is not documented.