| Date | User | Challenge | Score |
| lcybr19 | ASCII | 5 | |
| lcybr19 | Great Snakes | 3 | |
| Chnapak | Adrien's Signs | 80 | |
| gd6o45678j | Hex | 5 | |
| Thomas7249 | Base64 | 10 | |
| KingCrimson2077 | Privacy-Enhanced Mail? | 25 | |
| Chnapak | Chinese Remainder Theorem | 40 | |
| Thomas7249 | Hex | 5 | |
| tristanpetrovich | Favourite byte | 20 | |
| devsec1 | Bytes and Big Integers | 10 | |
| frogolonso | Chinese Remainder Theorem | 40 | |
| tristanpetrovich | XOR Properties | 15 | |
| dwbruijn | Modular Inverting | 25 | |
| Thomas7249 | ASCII | 5 | |
| apchhiii | Hex | 5 | |
| dwbruijn | Modular Arithmetic 2 | 20 | |
| KingCrimson2077 | Modular Inverting | 25 | |
| Chnapak | Modular Square Root | 35 | |
| gd6o45678j | ASCII | 5 | |
| blazzzhenny2 | XOR Properties | 15 | |
| KingCrimson2077 | Modular Arithmetic 2 | 20 | |
| KingCrimson2077 | Modular Arithmetic 1 | 20 | |
| lcybr19 | Finding Flags | 2 | |
| blazzzhenny2 | XOR Starter | 10 | |
| KingCrimson2077 | Extended GCD | 20 | |
| KingCrimson2077 | Greatest Common Divisor | 15 | |
| KingCrimson2077 | Lemur XOR | 40 | |
| YariyYariy | CTRIME | 70 | |
| Dessert | JSON in JSON | 40 | |
| Dessert | RSA or HMAC? | 35 | |
| pasichko | ASCII | 5 | |
| noTun4 | You either know, XOR you don't | 30 | |
| pasichko | Great Snakes | 3 | |
| Yoshift | Transparency | 50 | |
| AMSPRIMAL | Finding Flags | 2 | |
| agoyis | Base64 | 10 | |
| Yoshift | Modular Binomials | 80 | |
| KingCrimson2077 | Encoding Challenge | 40 | |
| Shriya_Arun | Passwords as Keys | 50 | |
| agoyis | Hex | 5 | |
| Dessert | JWT Secrets | 25 | |
| Dessert | No Way JOSE | 20 | |
| QWXXHSX123 | Everything is Still Big | 100 | |
| apchhiii | ASCII | 5 | |
| svinopas | Extended GCD | 20 | |
| apchhiii | Great Snakes | 3 | |
| apchhiii | Finding Flags | 2 | |
| noTun4 | Favourite byte | 20 | |
| blazzzhenny2 | Bytes and Big Integers | 10 | |
| blazzzhenny2 | Base64 | 10 |
You are now level Current level