We have implemented a complete gaming ecosystem with profile customization, internal purchases through Telegram Stars, ratings, a pumping system, adaptive AI and an administrative panel to manage events and users. Special attention is paid to the social aspect: players can form clans, invite friends, share resources and participate in team tournaments. The user-friendly interface, gamification of progress and the support of regular events help to attract and retain the audience. Sea War is an example of how, thanks to Telegram, it is possible to create a full-fledged game with wide possibilities and deep mechanics without the need to download it from the App Store or Google Play.