Paper Corners: Logic Puzzles

Paper Corners is a Shakashaka logic puzzle: place black triangles in a grid until every white region forms a rectangle. Some rectangles sit straight; others tilt at 45 degrees. The numbered squares tell you how many neighboring squares need triangles. Solve 222 pages in twenty-two chapters. Start with small boards, then work through larger pages up to 10 × 10. Choose a page by difficulty or follow the chapters in order. A short introduction teaches the rules. Four optional technique lessons let you practice triangle clues, white squares, and rectangle edges. If you get stuck, a hint marks a cell and explains the deduction. Undo and redo let you revisit any move. Play a daily page or choose an earlier date from the daily archive. An unfinished daily page stays available after midnight. Keep your finished pages in a composition library, with the white rectangles traced in indigo. Mark favorites, share an image, export printable sheets, or send a playable page link to a friend. Play offline on iPhone and iPad, without timers, lives, scores, or ads. The paper-and-ink design supports light and dark appearance, larger text, VoiceOver, Reduce Motion, and Increase Contrast. The original 102 pages and your personal notebook stay free. Paper Corners Pro is a one-time purchase that unlocks daily pages, chapters 11 to 22, and future additions. Purchases can be restored.