Rackets & Rats is a Queens (Star Battle) logic puzzle set in the 1920s: every board is a case file, and you pin down the capos before the turf war boils over.
Every board is proven solvable by pure deduction before it reaches you, so you never have to guess.
There is a Daily case, a weekly league against other detectives, and duels with a friend on the same board. Free, no ads, plays right in the browser.
Play it here: https://rodred.itch.io/rackets-and-rats
If a board ever feels unfair, or something is unclear, tell me in the comments.