Rat Run is the best series of logic puzzles I've played in a very long time. Definitely worth checking out. After playing a few weeks I'm on level 18 and bummed that I'm almost out of levels (for now!). Free to play on desktop, or the sudokupad app is $3 https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000IFI