Visual Silence

koushi adapts the classic experience of analog puzzle books for mobile devices, radically eliminating all the disturbing factors of modern gaming apps. Completely free of ads, time pressure, gamification, and haptic feedback.

Neuro-Inclusive Design

Features that support you:

• Smart Dimming: Reduces cognitive load by highlighting only relevant paths.
• Draft Mode: A safe space to experiment without the fear of making mistakes.
• No FOMO: The daily puzzle doesn't use streaks. Take a break anytime without losing progress.

Ethical Monetization

No subscriptions, no in-app currencies.

• Free Starter Pack: Get started with 50 levels completely for free.
• Daily Puzzles: A new puzzle every day, forever free.
• Honest Purchases: Buy optional themed packs for a one-time fee to support the solo developer.