According to @alice_und_bob, developer Daniel Cukier showed DOOM running on a local Polkadot JAM blockchain instance on his laptop and shared a step-by-step tutorial for others to replicate, indicating hands-on accessibility for builders, source: Alice und Bob on X, Dec 10, 2025; source: Daniel Cukier on X; source: YouTube tutorial linked by Daniel Cukier. The post explicitly quotes he ran DOOM on the Polkadot JAM blockchain on his laptop and invites others to run it too, confirming a reproducible demo rather than a concept-only teaser, source: Daniel Cukier on X; source: Alice und Bob on X, Dec 10, 2025. For traders, a working on-chain gaming demo is a concrete signal of developer experimentation and tooling maturity around DOT that market participants track via developer activity benchmarks, source: Alice und Bob on X, Dec 10, 2025; source: Electric Capital Developer Report 2023. Actionably, monitor DOT price, liquidity, and developer activity trends around JAM as reproducible tutorials lower friction for experimentation and can inform assessments of ecosystem momentum, source: YouTube tutorial linked by Daniel Cukier; source: Electric Capital Developer Report 2023.