On: '500-hour' Order of the Sinking Star is as complex and exhausting as it sounds

[krige]

Solving 600 10x10 jigsaw puzzles in a row would easily exhaust you without posing any challenge at all.

[bowsamic → krige]

In this case it’s more like 600 sudoku that introduce and teach new methods without needing an external guide, and that is great for me