Squid Game is a free challenge inspired by the popular Netflix series with the same name. Instead of engaging in bloodthirsty games, you progress to the next level by solving SQL puzzles. https://www.i-programmer.info/news/204-challenges/17846-can-you-win-the-sql-squid-game.html
CUDA is of course NVIDIA's toolkit and programming model which provides a development environment for speeding up computing applications by harnessing the power of GPUs. It's not easy to conquer, but here's a few resources to help. https://www.i-programmer.info/news/144-graphics-and-games/17842-three-nvidia-cuda-programming-super-resources-.html