Terms of Use

These Terms govern your use of Lumen (the “App”), provided by Caulderon Interactive. By downloading, installing or using the App, you agree to these Terms. If you do not agree, do not use the App.

Subject to these Terms, we grant you a limited, non-exclusive, non-transferable, revocable licence to install and use Lumen on devices you own or control for personal, non-commercial entertainment and creative use. The App, its code, design, audio and content are licensed, not sold.

Lumen combines puzzles, arcade steering and creative tools. Its two-dimensional geometric-optics model and explanatory text are for entertainment and informal exploration. Arcade steering, vessels, gates and related mechanics are fictional. The App is not laboratory, engineering, medical, safety, navigation or professional optical-design software and must not be relied upon for those purposes.

Lumen has no user account or cross-device cloud sync. Progress and compositions are stored locally. Clearing App data, uninstalling, device failure or operating-system action can permanently remove them. You are responsible for keeping copies of PNG artwork you wish to retain; we cannot recover local data we never receive.

This version awards fictional prisms for game accomplishments. The Photon Atelier lets you exchange them for cosmetic visual styles or limited-use puzzle and runner assistance. Prisms have no real-world value, are not money, and cannot be purchased, transferred, refunded, redeemed or converted into cash. No real-money checkout or Google Play Billing is integrated in this version.

When a Google Play update is available, Lumen may offer a flexible in-app download. You may postpone it unless Google Play or a future critical release requires otherwise. Updates may add, modify, rebalance, repair or remove features and are also governed by Google Play's terms.

You must not use Lumen unlawfully; bypass security or distribution controls; distribute modified or unauthorised copies; use the App or its assets to infringe another person's rights; or reverse engineer, decompile or disassemble it except where applicable law expressly permits.

Lumen's original source code, interface, writing, audiovisual presentation, synthesized audio and identity are owned by Caulderon Interactive or its licensors and protected by applicable law. Third-party open-source components remain under their own licences. Exporting artwork does not transfer ownership of the App or permit redistribution of App assets or source code.

Google Play provides distribution and in-app-update delivery under Google's terms and policies. We are not responsible for interruptions or decisions made by an external store or device provider.

To the maximum extent permitted by law, Lumen is provided “as is” and “as available” without warranties of uninterrupted availability, error-free operation, fitness for a particular purpose or preservation of local data. Nothing excludes consumer rights that applicable law does not permit us to exclude.

To the maximum extent permitted by law, Caulderon Interactive is not liable for indirect, incidental, special, consequential or punitive loss arising from use of the App, including loss of local progress or exported work. Any liability that cannot lawfully be excluded remains limited only as the law permits.

These Terms are governed by the laws of India. Subject to mandatory consumer-protection and jurisdiction rules, disputes are subject to the courts of Delhi, India.

We may update these Terms when Lumen or applicable requirements change. Continued use after an update takes effect constitutes acceptance where law permits. Questions may be sent to support@caulderoninteractive.com.