Zerko

Zerko combines arithmetic with spatial reasoning: place numbered blocks so that every value on the board becomes zero. Each shape affects several positions, making its footprint as important as the amount it subtracts. A move that solves one number can complicate another, so the challenge is finding an arrangement that satisfies the entire board. Handcrafted levels build on this single objective without adding a countdown or score target. The clean interface makes the remaining values easy to inspect, while subdued audio leaves room to think. It works offline and uses a one-time purchase, with no advertisements or in-app purchases.