I have played Sudoku since 2014 when I had a broken neck and back and was stuck in bed. I have played in many forms over the years, but settled on Open Sudoku on Android as it is free and open source. I actually use it as a gauge of my physical and mental state now. If I am sharp and doing reasonably well, I can finish hard puzzles that have a logical solution (without guessing) within 6 minutes at the most, usually around 5 minutes. If my times are more than 8 minutes after a few puzzles, I try to avoid interacting with people. It means I’m in more pain than I may realize and these are the times I tend to be…difficult. I try to ignore the constant pain as best I can, but the disconnect has its consequences. I can still play Sudoku though.