Abstract: A computer-implemented system coordinates multiple concurrent interactive applications via a central communication router maintaining sessions identified by session identifiers and application identifiers. The router directs messages between client devices without interpreting content. A session management module generates session identifiers paired with application identifiers. An onboarding module produces machine-readable codes enabling participants to join by scanning codes. An engine instantiation module creates engine instances executing application logic within isolated environments. A lifecycle management module suspends instances when inactive, saves states through serialization, and restores instances by deserializing saved states when devices reconnect. Client devices are assigned roles including host console, heads-up display, or controller. A shared service layer provides artificial intelligence integration, globalization, localization, and authentication accessible to all sessions.