Geometric logic for iPhone and iPad

One path.
Every line.
Once.

Kross is a precise, distraction-free puzzle game built around one deceptively simple challenge: draw a continuous curve that crosses every line exactly once.

Kross app icon showing a cyan curve crossing a white pentagon

Think ahead. Move with precision.

Plan your route, avoid every red node, and never cross the same segment twice. You may lift your finger whenever needed, but the same curve must continue precisely from the hand marker.

Draw one curve

Create a single continuous path through the geometric figure. Lift your finger when needed and resume only from the marked endpoint.

Cross every line once

Each segment must be crossed exactly one time. Do not trace along a line and do not touch it tangentially.

Avoid red nodes

Red nodes are off limits. Find a route with enough clearance to remain accurate from the first move to the last.

Kross gameplay showing a cyan curve crossing a geometric puzzle Kross Focus puzzle with red nodes and a continuous cyan path Kross level browser showing several geometric logic puzzles

300 carefully arranged puzzles.

Every level has been validated to have a solution. Difficulty grows through the logic of the route, subtle choices and deliberate traps—not visual clutter.

Learn

Understand the rules and build confidence.

Flow

Read clean shapes and discover efficient routes.

Focus

Navigate more strategic decisions and traps.

Master

Apply precision and logic to the deepest puzzles.

Interactive hints

Follow a guided solution path when you need a nudge.

No timers or lives

Solve every puzzle at your own pace, without pressure.

Made for Apple devices

Responsive layouts and precise touch controls for iPhone and iPad.

Inspired by Leonhard Euler’s analysis of the Seven Bridges of Königsberg, Kross brings the spirit of a classic mathematical puzzle into a modern geometric challenge.

Kross Premium

Kross is free to play, with levels unlocking progressively as you complete them. Premium is a one-time in-app purchase—never a subscription.

  • Unlock all levels immediately
  • Remove interstitial ads
  • Use hints without rewarded ads
  • Restore with the purchasing Apple ID

Privacy Policy

This Privacy Policy explains how information is handled when you use the Kross app for iPhone or iPad and this official Kross website.

Effective date: September 11, 2026  ·  Last updated: September 11, 2026

In plain language: Kross requires no account. Your game progress stays on your device. The free version uses Google AdMob for advertising, and Apple securely processes Premium purchases.

1. About Kross

This policy applies to the Kross app for iPhone and iPad and to this website. Kross does not require an account and does not operate a remote gameplay database. Your drawings, puzzle attempts and level solutions are not sent to us.

We do not add our own analytics or profiling tools. This website is informational only: it has no accounts, advertising or contact forms and does not set its own marketing cookies. Like most websites, its hosting provider may process basic technical information needed to deliver and protect the page, such as an IP address, browser type and request time.

2. Information stored on your device

Kross stores only the information needed to make the game work smoothly:

  • completed levels, the highest unlocked level and the level-catalog version;
  • simple advertising-frequency information, such as completion counters and the time of the latest full-screen ad;
  • the Premium entitlement needed to display the correct app experience;
  • privacy choices stored by Google’s consent tools where applicable.

Gameplay progress and advertising-frequency information remain locally on your device. The current version of Kross does not request access to your precise location, contacts, photos, camera, microphone or health data, and it does not request Apple’s App Tracking Transparency permission.

3. Advertising and consent

The free version of Kross uses Google AdMob to provide interstitial ads and rewarded ads. Rewarded ads may be offered before a hint. Interstitial ads appear only at configured gameplay intervals. Ads are not requested after Kross recognizes an active Premium purchase.

Depending on your region, device settings, privacy choices and the ad being delivered, Google and its advertising partners may process:

  • IP address, which may be used to estimate a general location;
  • device or app-related identifiers available under Apple’s rules;
  • advertising data, including ads shown and interactions with them;
  • app and ad interactions, such as launches, taps or rewarded-video views;
  • diagnostic, crash and performance information.

This information may be used to deliver and measure ads, limit repetition, prevent fraud, maintain security and improve advertising performance.

Your consent choices

Kross uses Google’s User Messaging Platform (UMP). Where a privacy message is required, it is displayed before ads are enabled. You can review or change the available choices through Privacy → Manage Consent inside Kross whenever Google requires that option.

Depending on your choices and applicable law, Google may provide personalized, non-personalized, limited or technical ads. Declining personalized advertising does not necessarily remove all ads; other permitted ad types may still appear.

More information is available in the Google Privacy Policy, Google’s partner-sites explanation and Google Mobile Ads SDK data disclosure.

4. Premium purchases

Kross Premium is an optional one-time in-app purchase processed securely by Apple through StoreKit and the App Store. Apple handles your Apple ID, payment method, billing and transaction information. Kross does not receive or store your full payment-card details.

The app receives only the transaction and entitlement information needed to confirm or restore Premium access. Apple handles purchase records according to its own policies. You can read App Store & Privacy and the Apple Privacy Policy.

5. Your choices

  • Review or change the available advertising choices through Privacy → Manage Consent in Kross.
  • Manage App Store purchases and device privacy settings through your Apple account or device settings.
  • Delete locally stored game information by removing the app and, where applicable, its associated backup.
  • Contact us using either email address below if you have a privacy question or request.

Depending on where you live, you may have rights to access, correct, delete, restrict or object to the processing of personal information, withdraw consent or appeal a privacy decision. Where applicable, processing is based on your consent, providing the service or purchase you requested, legitimate interests such as security and support, or legal obligations.

6. Retention and sharing

Local game information remains on your device until it is reset or removed, subject to Apple’s backup and restore behavior. Google and Apple retain information they process according to their own policies. Support emails are kept only as long as reasonably needed to answer the request, resolve a problem or meet a legal requirement.

We do not sell your personal information. Information is shared only with the service providers needed for advertising, consent management, purchases, website delivery and email support, or when required by law. These providers may process information in other countries under the safeguards described in their own privacy policies.

We use reasonable measures appropriate to the limited information handled by Kross, but no electronic storage or transmission method can be guaranteed to be completely secure.

7. Children’s privacy

Kross is a general-audience logic game and is not directed specifically to children under 13 or the equivalent minimum age in their country. We do not knowingly ask children to provide names, contact details or account information. If you believe a child has sent personal information directly to us, please contact us so it can be reviewed and deleted where appropriate.

8. Contact and updates

Questions, support requests and privacy concerns can be sent to:


octavianpetrescu2025@yahoo.com

This policy may be updated if Kross features, service providers or legal requirements change. The latest version will always be published on this page with an updated date.

Support

If you encounter a gameplay issue, purchase problem or privacy concern, email us with your device model, iOS or iPadOS version, Kross version and a brief description. Please do not send passwords, payment-card numbers or other unnecessary sensitive information.