| Date | User | Challenge | Score |
| Oblivi0n | Modular Arithmetic 1 | 20 | |
| eleanork | Favourite byte | 20 | |
| eleanork | XOR Properties | 15 | |
| InTime | Computing Shared Secrets | 30 | |
| jk0 | Base64 | 10 | |
| jk0 | Hex | 5 | |
| wdd | SSH Keys | 35 | |
| jk0 | ASCII | 5 | |
| wdd | CERTainly not | 30 | |
| jk0 | Great Snakes | 3 | |
| Oblivi0n | Extended GCD | 20 | |
| jk0 | Finding Flags | 2 | |
| an_yujin | Additive | 70 | |
| InTime | Computing Public Values | 25 | |
| wdd | Privacy-Enhanced Mail? | 25 | |
| Oblivi0n | Greatest Common Divisor | 15 | |
| valh4x | Blinding Light | 120 | |
| fox_wolf7 | Salty | 20 | |
| Oblivi0n | You either know, XOR you don't | 30 | |
| valh4x | Marin's Secrets | 50 | |
| valh4x | Infinite Descent | 50 | |
| valh4x | Signing Server | 60 | |
| Oblivi0n | Favourite byte | 20 | |
| Oblivi0n | XOR Properties | 15 | |
| Oblivi0n | XOR Starter | 10 | |
| eleanork | XOR Starter | 10 | |
| eleanork | Bytes and Big Integers | 10 | |
| Oblivi0n | Bytes and Big Integers | 10 | |
| Oblivi0n | Base64 | 10 | |
| an_yujin | A Twisted Mind | 80 | |
| Oblivi0n | Hex | 5 | |
| sujin | Let's Prove It Again | 175 | |
| Oblivi0n | ASCII | 5 | |
| diamond_celest | You either know, XOR you don't | 30 | |
| sujin | Mister Saplins The Prover | 125 | |
| diamond_celest | Favourite byte | 20 | |
| diamond_celest | XOR Properties | 15 | |
| shahidkalw | Greatest Common Divisor | 15 | |
| mutant_ninja | Passwords as Keys | 50 | |
| xenonmatrix | Finding Flags | 2 | |
| sujin | Let's Prove It | 120 | |
| sujin | Megalomaniac 3 | 120 | |
| sujin | Megalomaniac 2 | 120 | |
| sujin | Megalomaniac 1 | 100 | |
| Xaelis | Confusion through Substitution | 25 | |
| sujin | MDFlag | 125 | |
| moozwen | Monoprime | 30 | |
| OscarTurner | XOR Starter | 10 | |
| thrypuro | A Twisted Mind | 80 | |
| moozwen | Factoring | 15 |
You are now level Current level