Simon Tatham's puzzles are also available as mobile apps -- ad-free, and highly recommended -- and can also be played via the Web. The Signpost puzzle is my pe

Simon Tatham's puzzles are also available as mobile apps -- ad-free, and highly recommended -- and can also be played via the Web. The Signpost puzzle is my personal favourite. :) https://www.chiark.greenend.org.uk/~sgtatham/puzzles/ https://www.chiark.greenend.org.uk/~sgtatham/puzzles/