  In the realm of open and composable gaming, we envision platforms where users
actively expand, create, engage, and immerse themselves in a rich world of
entertainment. One promising avenue for achieving this vision is through fully
on-chain (FOC) games, where both game state and logic reside on the blockchain,
maximizing composability. However, we must grapple with inherent limitations
and trade-offs, particularly in terms of costs and scalability. This paper
proposes a framework that leverages the Solana Virtual Machine (SVM) to scale
FOC games without state fragmentation or compromised trust assumptions. The
framework introduces a systematic approach for discovering, utilizing, and
publishing modular pieces of logic as components deeply rooted in the
Entity-Component-System (ECS) pattern. To enhance scalability and resource
optimization, we introduce the concept of Ephemeral Rollups (ERs) that overcome
the tradeoffs of L2s horizontal scaling. These dedicated runtimes can be
customized to provide higher operational speed, configurable ticking
mechanisms, provable sessions and gasless transactions without
composability-scalability tradeoffs.
