Draw one curve
Create a single continuous path through the geometric figure. Lift your finger when needed and resume only from the marked endpoint.
Geometric logic for iPhone and iPad
Kross is a precise, distraction-free puzzle game built around one deceptively simple challenge: draw a continuous curve that crosses every line exactly once.
The challenge
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.
Create a single continuous path through the geometric figure. Lift your finger when needed and resume only from the marked endpoint.
Each segment must be crossed exactly one time. Do not trace along a line and do not touch it tangentially.
Red nodes are off limits. Find a route with enough clearance to remain accurate from the first move to the last.
Designed to progress
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.
Understand the rules and build confidence.
Read clean shapes and discover efficient routes.
Navigate more strategic decisions and traps.
Apply precision and logic to the deepest puzzles.
Follow a guided solution path when you need a nudge.
Solve every puzzle at your own pace, without pressure.
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.
This Privacy Policy explains how information is handled when you use the Kross app for iPhone or iPad and this official Kross website.
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.
Kross stores only the information needed to make the game work smoothly:
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.
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:
This information may be used to deliver and measure ads, limit repetition, prevent fraud, maintain security and improve advertising performance.
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.
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.
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.
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.
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.
Questions, support requests and privacy concerns can be sent to:
tavistudio@yahoo.com
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.
We are here to help
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.