I think leetcode is a fairly brainy and fun game aimed at programmers, but as you note leetcode-style algorithm puzzles are only tangentially related to the wor

I think leetcode is a fairly brainy and fun game aimed at programmers, but as you note leetcode-style algorithm puzzles are only tangentially related to the work you might actually do at one of these companies. And the fact that you have to grind it for employment makes it less fun. Maybe slightly better than making candidates do chess puzzles or solve Rubik's Cubes though.