| Date | User | Challenge | Score |
| Tactical_Nerd | Generators of Groups | 20 | |
| emmabb | Greatest Common Divisor | 15 | |
| aksamautu55 | XOR Starter | 10 | |
| Tactical_Nerd | Working with Fields | 10 | |
| Tactical_Nerd | Modulus Inutilis | 50 | |
| billiambill | Great Snakes | 3 | |
| Tactical_Nerd | Salty | 20 | |
| billiambill | Finding Flags | 2 | |
| avm | Gram Schmidt | 30 | |
| avm | Gaussian Reduction | 50 | |
| avm | What's a Lattice? | 40 | |
| avm | Size and Basis | 15 | |
| avm | Vectors | 10 | |
| gumbat70 | Jack's Birthday Confusion | 30 | |
| EvanKhatiwada | Finding Flags | 2 | |
| Orion_Pax89 | Great Snakes | 3 | |
| gumbat70 | Jack's Birthday Hash | 20 | |
| 7anF | You either know, XOR you don't | 30 | |
| lamchop | Background Reading | 5 | |
| 7anF | Favourite byte | 20 | |
| Blood_Deckker | Hex | 5 | |
| 7anF | XOR Properties | 15 | |
| Frahri | You either know, XOR you don't | 30 | |
| Orion_Pax89 | Finding Flags | 2 | |
| 7anF | XOR Starter | 10 | |
| 7anF | Bytes and Big Integers | 10 | |
| 7anF | Base64 | 10 | |
| 7anF | Hex | 5 | |
| avm | Blinding Light | 120 | |
| Frahri | Favourite byte | 20 | |
| lamchop | Round Keys | 20 | |
| Frahri | XOR Properties | 15 | |
| 7anF | ASCII | 5 | |
| 7anF | Great Snakes | 3 | |
| lamchop | Resisting Bruteforce | 10 | |
| lamchop | Keyed Permutations | 5 | |
| Skinny | Favourite byte | 20 | |
| 7anF | Finding Flags | 2 | |
| cuitbear | Hex | 5 | |
| lumpy | Round Keys | 20 | |
| lumpy | Structure of AES | 15 | |
| edlks1379 | Quadratic Residues | 25 | |
| avm | Infinite Descent | 50 | |
| GKingy | Finding Flags | 2 | |
| avm | Marin's Secrets | 50 | |
| Ziablik | Favourite byte | 20 | |
| adham_saleh | Encoding Challenge | 40 | |
| edlks1379 | Modular Inverting | 25 | |
| AlexTheGreat67 | Hex | 5 | |
| edlks1379 | Modular Arithmetic 2 | 20 |
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