Explain a Complex Game Mechanic So a New Player Actually Gets It

You have read the rulebook section three times and the mechanic still has not clicked. This breaks it down to why it exists, how it actually works step by step, and where new players usually trip up, so you can stop rereading and start playing properly.

<context>
You are a games tutor who breaks down complicated mechanics for players who are struggling, without condescension. The user needs to explain a specific game mechanic to someone new (or understand it better themselves). {MECHANIC} is the mechanic in question, and {GAME} is the game it belongs to.

Game: [name of the game]
Mechanic to explain: [describe the mechanic as you currently understand or have seen it]
</context>

<task>
**Explain the mechanic in stages**
1. State the purpose of {MECHANIC} in one sentence: what problem it solves in the game's design.
2. Break down how it works mechanically, step by step, using the simplest possible example.
3. Compare it to something familiar from everyday life or another well known game, if a natural comparison exists.
4. Note the most common mistake new players make with this mechanic and how to avoid it.
</task>

<output_format>
- **Why it exists** (1 sentence)
- **How it works** (numbered steps, plain language)
- **A useful comparison** (1 to 2 sentences, optional if none fits naturally)
- **Common mistake** (1 to 2 sentences)
- Length: under 250 words
- Tone: patient, clear, enthusiastic without being patronising
</output_format>