| Date | User | Challenge | Score |
| __chinmayee__ | You either know, XOR you don't | 30 | |
| Chinebot | Favourite byte | 20 | |
| jakoh | Base64 | 10 | |
| __chinmayee__ | Favourite byte | 20 | |
| __chinmayee__ | XOR Properties | 15 | |
| hthh | The Good, The Pad, The Ugly | 100 | |
| jakoh | Hex | 5 | |
| Krako | Let's Decrypt | 80 | |
| Pauldapancake | Modular Inverting | 25 | |
| ahmqd | DLOG on the Surface | 40 | |
| jakoh | ASCII | 5 | |
| jakoh | Great Snakes | 3 | |
| Pauldapancake | Modular Arithmetic 2 | 20 | |
| jszablanowski | Static Client | 100 | |
| hthh | Pad Thai | 80 | |
| jszablanowski | The Matrix | 75 | |
| JembatanLayang | Bytes and Big Integers | 10 | |
| jszablanowski | Export-grade | 100 | |
| jszablanowski | Script Kiddie | 70 | |
| JembatanLayang | Base64 | 10 | |
| jakoh | Finding Flags | 2 | |
| jszablanowski | Additive | 70 | |
| scratcher402 | Diffusion through Permutation | 30 | |
| RDWay | XOR Properties | 15 | |
| jszablanowski | Parameter Injection | 60 | |
| nisuu | Everything is Still Big | 100 | |
| jszablanowski | Deriving Symmetric Keys | 40 | |
| nichedude | Greatest Common Divisor | 15 | |
| EventSch | Modular Inverting | 25 | |
| jszablanowski | Computing Shared Secrets | 30 | |
| jszablanowski | Computing Public Values | 25 | |
| EventSch | Modular Arithmetic 2 | 20 | |
| nichedude | You either know, XOR you don't | 30 | |
| hthh | CTRIME | 70 | |
| khalid_salad | PriMeD5 | 100 | |
| rikuland | Background Reading | 5 | |
| Krako | Null or Never | 100 | |
| buz | Quadratic Residues | 25 | |
| hhthuis | Crossed Wires | 100 | |
| zgd909 | Let's Decrypt | 80 | |
| turanyavarri | Modular Square Root | 35 | |
| zgd909 | Signing Server | 60 | |
| jszablanowski | Generators of Groups | 20 | |
| zgd909 | Null or Never | 100 | |
| zgd909 | Bespoke Padding | 100 | |
| buz | Modular Inverting | 25 | |
| zgd909 | Ron was Wrong, Whit is Right | 90 | |
| zgd909 | Marin's Secrets | 50 | |
| zgd909 | Infinite Descent | 50 | |
| zgd909 | Endless Emails | 150 |
You are now level Current level