The Blockly maze thing is interesting, but you should realize that you're implicitly biasing against people with poor spatial skills. My ex-wife is a concert-l

The Blockly maze thing is interesting, but you should realize that you're implicitly biasing against people with poor spatial skills. My ex-wife is a concert-level pianist who can remember texts (words) after only hearing them once. She's also, astonishingly bad at spatial tasks (gender stereotypes aside). So unless you're hiring for computer graphics, or visualization or some-such, which has a clear spatial component, you're implicitly biasing against less-spatial people.