Prototype Fast Get a mechanic into a player's hands fast to learn whether it's worth building. The output of a prototype is a decision (keep / kill / refactor), not a product. Optimize for learning speed, and decide up front whether the code is throwaway or load-bearing. When to use - Use when validating a single mechanic or "what if", building a vertical slice / MVP, greyboxing a level or interaction, or de-risking an idea before committing real time. - Use when the user says "just get something playable", "is this fun?", or "rough it in". When not to use: a timed competition with a deadline…