| Date | User | Challenge | Score |
| AstroHammy | Round Keys | 20 | |
| zhou11 | Bean Counter | 60 | |
| zhou11 | Symmetry | 50 | |
| Johnny454 | Factoring | 15 | |
| zhou11 | Flipping Cookie | 60 | |
| zhou11 | ECB CBC WTF | 55 | |
| lms49 | Base64 | 10 | |
| desa_05 | Modular Arithmetic 2 | 20 | |
| lms49 | Hex | 5 | |
| whoami4 | Resisting Bruteforce | 10 | |
| desa_05 | Modular Arithmetic 1 | 20 | |
| kjayavardhan27 | Base64 | 10 | |
| avery_leCunt | Base64 | 10 | |
| kjayavardhan27 | Hex | 5 | |
| lms49 | ASCII | 5 | |
| whoami4 | Keyed Permutations | 5 | |
| avery_leCunt | Hex | 5 | |
| shewitt2 | Base64 | 10 | |
| lms49 | Great Snakes | 3 | |
| zhou11 | ECB Oracle | 60 | |
| kuroguro | Modular Arithmetic 2 | 20 | |
| zhou11 | Passwords as Keys | 50 | |
| kuroguro | Modular Arithmetic 1 | 20 | |
| Loccturno | Finding Flags | 2 | |
| zhou11 | Modes of Operation Starter | 15 | |
| lms49 | Finding Flags | 2 | |
| kieugiathinhphat | Let's Prove It | 120 | |
| zhou11 | Bringing It All Together | 50 | |
| zhou11 | Diffusion through Permutation | 30 | |
| zhou11 | Confusion through Substitution | 25 | |
| zhou11 | Round Keys | 20 | |
| zhou11 | Structure of AES | 15 | |
| zhou11 | Resisting Bruteforce | 10 | |
| Komasan_ | Twisted CSIDH Isogenies | 70 | |
| Elkhan | XOR Properties | 15 | |
| shewitt2 | Hex | 5 | |
| ChickenJockey64 | Greatest Common Divisor | 15 | |
| zhou11 | Keyed Permutations | 5 | |
| zhou11 | You either know, XOR you don't | 30 | |
| zhou11 | Favourite byte | 20 | |
| shewitt2 | ASCII | 5 | |
| zhou11 | XOR Properties | 15 | |
| ChickenJockey64 | You either know, XOR you don't | 30 | |
| jdmremi | Gaussian Reduction | 50 | |
| Hari542 | Modular Arithmetic 2 | 20 | |
| sveta_shumovai | The Matrix | 75 | |
| saro | Trust Games | 150 | |
| jdmremi | What's a Lattice? | 40 | |
| percy | Network Attacks | 5 | |
| jdmremi | Gram Schmidt | 30 |
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