2023-12-21 Added a divisibility checker and updated the highlighter to correctly prevent three regions near absent tiles; rephrased the rules with special attention to this behaviour. A suggestion by PinkHoodie, who also sent a puzzle! 2024-01-11 Corrected a recent regression found by Yu Ho2024-05-24PinkHoodie included this genre in a puzzle series themed after the 26 letters of the alphabet! 2025-01-09 Clarified the ruleset as pointed out by PinkHoodie, and corrected a link on this page 2025-01-12puzzlettersPinkHoodie crafted 1 Crowded Intersections (classic) puzzle - danke!