LineaLogic vs Quadrivium

A real logic game. Not another app stuffed with ads. Not a subscription that costs you more every month. Just an elegant puzzle where every challenge is solved by reasoning. That's LineaLogic. ■ THE CONCEPT Every puzzle gives you a clue. Your job: pick the right sticks — each one has a color and a size — to satisfy every constraint at the same time. The twist? Constraints overlap. A large red stick counts as both "1 large" AND "1 red". Read carefully, reason it out, choose right. Easy to learn. Demanding to master. ■ WHAT YOU GET → 7 progressive difficulty levels, 70+ deduction puzzles. → Level 1 is completely free — try before you buy. → Zero ads. Ever. Anywhere. → Zero subscriptions. One single lifetime purchase unlocks everything. → No timer, no lives, no game over. Take your time to think. ■ WHY LINEALOGIC IS DIFFERENT Most logic games drown you in ads or charge you every month. LineaLogic respects your time and your money: • Clean, premium design — crisp typography, bold colors, zero distractions. Pure thinking. • A unique mechanic — reading clues and overlapping constraints, not a simple "count the objects". • Clear feedback — a wrong answer tells you why, and you fix it. You learn as you play. • Works offline — on the subway, on a plane, anywhere. • No account required — play immediately. ■ WHO IS THIS FOR? • You love Sudoku and deduction riddles • You want a calm game to give your brain a workout • You want a smart puzzle to share with the family (ages 6+) • You appreciate premium apps with no ads and no subscriptions ■ THE LINEALOGIC FAMILY LineaLogic is the sister app of KubiLogic: same standards, same polished design, same promise — no ads, no subscriptions, one lifetime purchase. If you loved one, you'll love the other. ■ THE MATH IS SIMPLE Dozens of puzzles, hours of thinking, a single payment. Compare that to any $9.99/month subscription. Download LineaLogic. Start with the free level. And when you're hooked, unlock everything. Your brain deserves better than an ad every 30 seconds.

Four logic puzzles on one square grid. Futoshiki, Skyscrapers, Magic Square and Calcudoku share the same board. In three of them every digit appears once per row and column, and the Magic Square uses every number exactly once. What differs is the clue around the grid: the signs between two cells, the numbers along the edge, the sum of every line, the target of a cage. Every puzzle is generated when you start it. You choose the size and the level, and for Calcudoku also which operations appear and how large a cage may grow. The hint never leaves you stuck. It names the rule that applies right now and shows the cells it applies to. Every puzzle the app builds can be solved with the techniques of its own level: no guessing, no dead ends. A daily puzzle, one puzzle type per weekday. Statistics, achievements, ten color worlds, and a newspaper world of its own on iPad. No account, no ads, no tracking. What you play stays on your device. I build this on my own: every rule, every hint, all 45 languages, one desk. No studio behind me, no ads, no tracking, no subscription. Write to me and a person answers. Happy puzzling, Tobias