| Date | User | Challenge | Score |
| Mb3gems | Favourite byte | 20 | |
| richardkasdorf | Hex | 5 | |
| Mb3gems | XOR Properties | 15 | |
| jtm85 | Modes of Operation Starter | 15 | |
| UnlamG1MA | Modulus Inutilis | 50 | |
| rizv_exe | No Random, No Bias | 120 | |
| JonathanSDC8 | ECB CBC WTF | 55 | |
| JonathanSDC8 | Bean Counter | 60 | |
| JonathanSDC8 | Symmetry | 50 | |
| richardkasdorf | ASCII | 5 | |
| JonathanSDC8 | Flipping Cookie | 60 | |
| richardkasdorf | Great Snakes | 3 | |
| richardkasdorf | Finding Flags | 2 | |
| UnlamG1MA | Salty | 20 | |
| faster | You either know, XOR you don't | 30 | |
| cherrie | ASCII | 5 | |
| cherrie | Great Snakes | 3 | |
| uglybarnacle | Quadratic Residues | 25 | |
| MF47 | Hex | 5 | |
| stellev | No Way JOSE | 20 | |
| RandyTheMan | Bytes and Big Integers | 10 | |
| dcazun | Base64 | 10 | |
| Damsssss | Gotta Go Fast | 40 | |
| stellev | JWT Secrets | 25 | |
| dcazun | Hex | 5 | |
| dcazun | ASCII | 5 | |
| dcazun | Great Snakes | 3 | |
| dcazun | Finding Flags | 2 | |
| entheo97 | Privacy-Enhanced Mail? | 25 | |
| MF47 | ASCII | 5 | |
| RandyTheMan | Base64 | 10 | |
| bhupen07_ | Base64 | 10 | |
| uglybarnacle | Modular Inverting | 25 | |
| RandyTheMan | Hex | 5 | |
| Damsssss | Non-Interactive | 35 | |
| RandyTheMan | ASCII | 5 | |
| bhupen07_ | Hex | 5 | |
| JonathanSDC8 | Passwords as Keys | 50 | |
| adriia0 | You either know, XOR you don't | 30 | |
| 0xFFFFFF | Triple DES | 60 | |
| bhupen07_ | ASCII | 5 | |
| RandyTheMan | Great Snakes | 3 | |
| sari_levinstein | Finding Flags | 2 | |
| bhupen07_ | Great Snakes | 3 | |
| bhupen07_ | Finding Flags | 2 | |
| Eliott | Computing Shared Secrets | 30 | |
| Wenennefer | Find the Lattice | 100 | |
| RandyTheMan | Finding Flags | 2 | |
| uglybarnacle | Modular Arithmetic 2 | 20 | |
| m4rked | CTRIME | 70 |
You are now level Current level