Catcross: Cats & Mice

Place one cat in every row, every column and every outlined region. No two cats may touch — not side by side, not corner to corner. Every board has a single answer, and every answer can be reasoned out. Nothing in Catcross ever asks you to guess. 850 puzzles across three stages, every one checked by machine before it shipped. CATS The rules on their own, from gentle 5×5 grids up to 10×10. 600 boards, ordered so the difficulty climbs a step at a time. CATS & MICE Every cat rule still holds, and a huddle of mice joins the board. No two mice share a region, every mouse touches another mouse edge to edge, and none will go anywhere near a cat. 200 boards. MICE FIRST The same rules, built so the cats will not settle on their own. More than one arrangement survives the cat rules, and the only way to tell them apart is to ask which one leaves the mice somewhere to huddle. 50 boards. LEARN IN A…