Shinshinka

Shinshinka — The Arrow Graph Puzzle
Sharpen your mind with Shinshinka, an innovative logic puzzle game that challenges the way you think. Connect the dots, follow the rules, and build the perfect graph — one arrow at a time.
How it works
Every puzzle is a hidden network of nodes connected by arrows. Starting from A1, each next node must be exactly one step greater — increase the letter, the number, or both by one. Fill in the missing nodes and arrows to complete the graph, making sure every tile is connected and nothing is left empty.
Simple to learn. Endlessly challenging to master.
Why you'll love it
• Exercises logical reasoning, pattern recognition, and working memory
• Every puzzle has one unique solution — no guessing, pure deduction
• Over 15,000 boards and growing — new puzzles added daily
• Scales in difficulty — from compact 4×4 grids to demanding 12×12 puzzles, with every size in between
• Built-in tutorial walks you through every rule before your first real puzzle
• Free hints when you're stuck, so you never have to give up
Features
• 15,000+ handcrafted puzzles with more added every day
• Multiple grid sizes for every skill level
• Relaxing ambient music and satisfying sound effects
• Clean, minimal design that keeps the focus on the puzzle
• Play offline — puzzles are cached for on-the-go solving
• Suitable for all ages

Shinshinka is completely free to download and play, supported by optional ads. No subscriptions, no paywalls — just pure puzzle solving.
Whether you have 5 minutes or 5 hours, Shinshinka is the perfect mental workout. Download now and see how far your logic can take you.