A tiny RPG loop can be evaluated quickly without pretending that thirty seconds is a universal benchmark. Treat it as an observation protocol: can a new player understand one loop, act, and see a payoff without explanation?
Use three checkpoints.
First, teach. The opening state should expose one actionable signal: a blocked path, a visible threat, a missing item, or a character request. The player should not need a paragraph of lore to know what can be attempted.
Second, test. The player makes one decision that changes state. They spend a resource, choose a route, use an ability, or accept a risk. The game should respond clearly enough that the player can connect action and consequence.
Third, pay off. The result does not need to be large. A shortcut opens, an enemy pattern changes, inventory becomes constrained, or new information reframes the next choice. The important part is that the payoff confirms the rule the player just learned.
