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      "mode": "rhythm-door",
      "geometry": "square",
      "difficulty": "入门",
      "title": "第一步后门开：认识落格切换",
      "caption": "只有一道门，没有开关格。空盘门关；每落一格就切换一次，包括起点：第1格后开、第2格后关。移动前看当前门位，落格后再切换。不能原地等待切换，撤销会倒回状态。",
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      "第 3 格后门开，从 c5 走向 c2，落格后门关；空盘门关、起步也切换"
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    "keyFork": {
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    "review": "自动验证通过；难度与人类推理顺序待真人试玩确认"
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      "mode": "rhythm-door",
      "geometry": "square",
      "difficulty": "入门",
      "title": "第二步后门关：先绕行再通过",
      "caption": "只有一道门，没有开关格。空盘门关；每落一格就切换一次，包括起点：第1格后开、第2格后关。移动前看当前门位，落格后再切换。不能原地等待切换，撤销会倒回状态。",
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    "reason": "这一步门是关闭的",
    "review": "自动验证通过；难度与人类推理顺序待真人试玩确认"
  },
  {
    "level": {
      "id": "03",
      "mode": "rhythm-door",
      "geometry": "square",
      "difficulty": "普通",
      "title": "门旁近路被当前状态挡住",
      "caption": "",
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          "y": 1,
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    "witnesses": [
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      "第 3 格后门开，从 c1 走向 c0，落格后门关；空盘门关、起步也切换"
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      "correct": "c2",
      "tempting": "c7"
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    "reason": "这一步门是关闭的",
    "review": "自动验证通过；难度与人类推理顺序待真人试玩确认"
  },
  {
    "level": {
      "id": "04",
      "mode": "rhythm-door",
      "geometry": "square",
      "difficulty": "普通",
      "title": "用中段数字推算门的开关",
      "caption": "",
      "cells": [
        {
          "id": "c0",
          "x": 0,
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          "w": 1,
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      "mode": "rhythm-door",
      "geometry": "square",
      "difficulty": "进阶",
      "title": "从另一侧进入门，规划到达步数",
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