Slacken
Untie the lines. No timers.
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
The classic planarity puzzle, rebuilt for 2026. No timers. No move limits. Just you, a tangle of lines, and the satisfying click of the final crossing dissolving.
Slacken is a puzzle of pure spatial reasoning. Each level hands you a tangle of nodes connected by straight lines. Your job: drag the nodes around the canvas until no two lines cross.
That's the whole game. No timers. No move counters. No coins, gems, or energy meters. No predatory ads interrupting every level. Every puzzle is provably solvable by construction, so you never have to wonder whether you've hit a dead end.
— FEATURES —
• 90 hand-tuned levels spanning seven classic graph topologies — wheels, ladders, grids, prisms, antiprisms, triangulated polygons, random planar graphs.
• Endless mode: unlimited procedurally-generated puzzles, deterministically seeded so a given level number always produces the same puzzle.
• A daily challenge — one date-seeded puzzle, the same for every player in the world. Keep the streak alive.
• The Specimen Archive: every first solve files a collectible graph specimen. 56 to catalogue, from common Cartwheels to legendary Delaunay's Dream.
• Personal bests per level — fewest moves and fastest time tracked separately. Beat your own records.
• Three visual themes: the drafting-paper Blueprint, plus Midnight and Ember for subscribers.
• A three-tier hint system for when you're stuck. One free hint per day; more available as in-app purchases.
• Optional ad-free subscription. Cancel any time.
• Designed in the spirit of Threes, Mini Metro, and A Good Snowman: minimal chrome, calm palette, gentle sound, satisfying haptics on every resolved crossing.
• Portrait, single-hand, no internet connection required to play.
— HOW IT WORKS —
Each puzzle is a planar graph that has been visually scrambled. Lines cross where the nodes have been displaced from their solved positions. Drag a node and the lines connected to it follow in real time, turning red whenever they intersect another line. Untangle the graph and the puzzle is done.
— RESPECTFUL MONETIZATION —
Slacken is built around the idea that puzzle players deserve to be treated like adults. Ads are interstitial only, every three levels, and you can remove them entirely with a low-cost subscription. Hint packs are consumable; nothing in the app is gated behind virtual currency, daily logins, or watch-an-ad-to-continue mechanics.
— TECHNICAL —
• iPhone only, iOS 17 and later.
• Portrait orientation.
• English only in v1 (more languages coming based on demand).
• No analytics or crash-reporting SDKs. Crash diagnostics happen via Apple's standard App Store Connect tooling and only if you opt in via Settings → Privacy & Security → Analytics.
— PRIVACY —
Slacken has no user accounts and stores no personal data on any server we operate. Read the full privacy policy at the URL in the support section.
— TERMS —
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://jinyangwang27.github.io/slacken-site/privacy/
Ad-Free Monthly and Ad-Free Annual are auto-renewing subscriptions. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in Settings → Apple Account → Subscriptions.
Happy untangling.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Jinyang Wang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jinyang Wang
- Size
- 6.4 MB
- Category
- Casual
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Hint Pack — 50 $3.99
- Hint Pack — 15 $1.99
- Hint Pack — 5 $0.99
- Ad-Free Annual $10.99
- Ad-Free Monthly $1.99
- Copyright
- © 2026 Jinyang Wang
