Loops vs Calcudoku

Close the loop. Loops is Slitherlink — the classic logic puzzle from Japan — built for iPhone and iPad with eight hand-made styles and an original soundtrack of calm music. No ads, no subscription: start free, unlock everything with one purchase. HOW IT WORKS Draw a single loop along the dotted grid. Each number tells you how many of its sides the loop uses. The loop never crosses itself and never branches. That’s the whole rulebook: every puzzle has exactly one solution, and you reach it by logic, not by guessing. NEW IN LOOPS • Pentagons — a fifth shape: 250 puzzles on the Cairo tiling, an irregular lattice that makes familiar patterns feel new. • Eight hand-made styles, each a world of its own with its own paper, ink, sounds and music — washi and vermilion, brush strokes on rice paper, sepia parchment, pure ink, newsprint with blue pencil, Czech folk indigo, sage atelier and carbon with gold. • An original soundtrack of 33 calm pieces — piano, koto, shakuhachi and temple bowls, and music written for each style, from lute and jazz piano to cimbalom and cello. Every style also draws with its own sound: a brush on rice paper, a quill on parchment, a pencil on newsprint, needle and thread on linen. • The Dojo — 14 interactive lessons, from your first zero to master-level reasoning. Watch the rule, then find the move yourself on a real board. • Ranks — climb from 10 kyu to 7 dan. Harder puzzles, clean solves and new shapes are worth more. • Hints that catch mistakes — if a line of yours is wrong, the hint shows you where before anything else. • Widgets for your Home and Lock Screen — today’s puzzle and your streak at a glance. WHAT’S INSIDE • 1,250 puzzles, each with exactly one solution, in five shapes — squares, hexagons, triangles, diamonds and pentagons — and five difficulties, from a five-minute warm-up to Master. • A new daily puzzle, with streaks that forgive one missed day, a gentle reminder and a daily leaderboard. • Draw by dragging. One finger is the pen; hold an edge or switch the pen to mark a cross. Pinch to zoom on the big boards. • Zen mode hides the clock and every button. Just you and the loop. • Your collection: every loop you close stays in the gallery, with badges for streaks, clean solves and Master levels. • Undo and redo, smart crosses, pen colors, sound and haptics, detailed statistics — and iCloud sync between your iPhone and iPad. FREE TO START Download Loops and play 29 career puzzles — squares, hexagons and a first taste of pentagons — 3 daily puzzles, the whole Dojo and two styles. Hints, ranks, zen mode, widgets and the collection are included. No ads, ever. THE FULL GAME — ONE PURCHASE Unlock everything once: all 1,250 puzzles in five shapes, the daily puzzle every day plus the whole archive, all eight styles and every shape we add in the future. No subscription, no ads, no tricks — yours for good, and restorable on all your devices. MADE IN PRAGUE BY ONE PERSON Loops is an independent game, designed and built by a single developer in Prague who loves logic puzzles. No team, no ad networks, no tracking — a puzzle game made the way good puzzle games used to be made. If you enjoy sudoku, nonograms, kakuro or a quiet ten minutes with a pencil, you will feel at home.

If you love Sudoku but are looking for a deeper challenge, or if you simply enjoy games that give your brain a real workout, Calcudoku is the ultimate logic puzzle. It combines the grid-filling deduction of Sudoku with simple arithmetic, creating a deeply satisfying balance of mental math, strategy, and problem-solving. Whether you want to sharpen your focus, keep your mind agile during a quick break, or master complex logical deduction, Calcudoku offers endless replayability for beginners and puzzle veterans alike. --- WHAT IS CALCUDOKU? --- Also known as Mathdoku or KenKen®, Calcudoku challenges you to solve a grid using logic and arithmetic: • Grid: Fill an N x N grid so that every row and column contains the numbers 1 through N exactly once without repeating. You choose the grid size to solve, anywhere from a 3x3 to a 9x9. • Cages: Outlined groups of cells (cages) each display a target number and an arithmetic operator. • Math: The numbers in each cage must combine using its operator (+, −, ×, ÷) to hit the target. Numbers can repeat within a cage as long as they stay in different rows and columns. It’s the ultimate combination of mental math, pattern recognition, and pure deduction. --- THE SMART DIFFERENTIATOR --- Many puzzle apps ruin the fun when you get stuck by simply filling in a random cell for you when requesting help. Our app takes a different approach: it teaches you how to solve it. If you hit a wall, our built-in helper analyzes your exact grid state and explains the logical next step. The engine guides you through genuine deduction strategies—showing you how to cross-reference overlapping cages, prune cell candidates, and leverage your notes so you can solve the grid completely on your own. --- KEY GAME FEATURES --- • Intelligent Explanations: Step-by-step guidance focused on note-taking, elimination strategies, and candidate pruning rather than giving away answers. • Optional Auto-Notes: The settings tab provides the option to jump into a puzzle with the initial candidate notes based on cage arithmetic. Skip the mundane and get right to the logic! • Smooth Input: Rapidly input answers and edit candidate notes with an intuitive, fluid UI built for mobile screens. • Complete Arithmetic Variety: Play grids featuring addition, subtraction, multiplication, and division. • All Skill Levels: Progress from quick 3x3 warmups to grueling 9x9 logic grids. • Polished Interface: Full native dark mode support, crisp typography, and seamless offline play - no Wi-Fi required. Master the grid, elevate your deduction skills, and train your brain with a game that actually makes you a better solver.