The maplewave challenges featured a custom binary to encode audio data in a custom format, with no available playback function. It involved 3 challenges, each with a different encoding method, in which we needed to extract the raw audio data and find a way to play it. My teammates solved the first challenge while I solved the latter two, and in the process I learned a few things about audio signals and different transforms, very much enjoyed playing the challenges!
PwnyOS is a custom operating system that was developed for uiuctf 2020 and made a return in 2021 with a new version(1.1). I found it a very interesting idea that taught me a lot about how things work at a lower level in operating systems and computers, so I’d like to thank Ravi for taking the effort to create the OS and these challenges.