There’s no brain twisters I’ve heard (even the ones I acquired from job interviews over the years) that’s more interesting than the math involved in generating visuals and motions from code.
Source code are posted on https://github.com/l1990790120/mspaint.exe and visuals and motions are published on https://www.instagram.com/engineer.lulu.
To the inspiring software engineers that’s leet coding your way into a job, I highly recommend trying these out, you’ll find way more satisfaction playing with actual algorithms and math than leet code.