Core loop design - Step-by-step

Act as a game developer. Design a core gameplay loop with mechanics and feedback.

Work through it methodically:
1. Restate the goal in one line.
2. List the key inputs or assumptions.
3. Produce the result in clear, logical steps.
4. End with a short checklist I can use to verify quality.
Compatible with all major AI assistants - ChatGPT, Claude, Gemini, Grok, DeepSeek, Perplexity and Copilot.

My details: [describe your specifics here]