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      "mode": "direction",
      "geometry": "square",
      "difficulty": "入门",
      "title": "横向通道：只从左、右进出",
      "caption": "每格一次。通道图形连接哪两条边，就必须从这两边进出：横线只通左右，竖线只通上下，拐角只通图示两边，均可反向。通道格不能是起终点。",
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      "c1 在第 2 步，必须左右直行"
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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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  {
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      "mode": "direction",
      "geometry": "square",
      "difficulty": "入门",
      "title": "拐角通道：认清连接的两条边",
      "caption": "每格一次。通道图形连接哪两条边，就必须从这两边进出：横线只通左右，竖线只通上下，拐角只通图示两边，均可反向。通道格不能是起终点。",
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          "direction": "dr"
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        },
        {
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          "y": 2,
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          "h": 1
        }
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    },
    "author": [
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      "c0",
      "c3",
      "c6",
      "c7",
      "c4",
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    "basePathCount": 24,
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      "c0 在第 2 步，必须右与下"
    ],
    "keyFork": {
      "step": 2,
      "correct": "c0",
      "tempting": "c2"
    },
    "reason": "进出方向不符",
    "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": "direction",
      "geometry": "square",
      "difficulty": "普通",
      "title": "纵向通道：只从上、下进出",
      "caption": "",
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          "y": 0,
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          "id": "c2",
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          "y": 1,
          "w": 1,
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        "constraint": "direction:c5",
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      "c5 在第 4 步，必须上下直行"
    ],
    "keyFork": {
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      "correct": "c0",
      "tempting": "c5"
    },
    "reason": "进出方向不符",
    "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": "direction",
      "geometry": "square",
      "difficulty": "普通",
      "title": "两种拐角配合选路",
      "caption": "",
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          "id": "c3",
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          "y": 0,
          "w": 1,
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          "direction": "ru"
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          "direction": "dl"
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          "id": "c9",
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          "id": "c10",
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          "y": 2,
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        "constraint": "direction:c5",
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        "constraint": "direction:c7",
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    "basePathCount": 124,
    "attempt": 17,
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      "c5 在第 9 步，必须上与右",
      "c7 在第 7 步，必须下与左"
    ],
    "keyFork": {
      "step": 2,
      "correct": "c4",
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    "reason": "进出方向不符",
    "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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  {
    "level": {
      "id": "05",
      "mode": "direction",
      "geometry": "square",
      "difficulty": "进阶",
      "title": "横、竖、拐角共同排除错误出口",
      "caption": "",
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      "c4 在第 7 步，必须上下直行",
      "c10 在第 2 步，必须右与下"
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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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      "geometry": "square",
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      "title": "通道与绕行区域配合",
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      "c3",
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      "c11",
      "c15",
      "c14",
      "c17",
      "c16",
      "c13",
      "c9",
      "c10",
      "c6",
      "c5",
      "c4",
      "c8",
      "c12"
    ],
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        "constraint": "direction:c2",
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          "c5",
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        ]
      },
      {
        "constraint": "direction:c4",
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          "c0",
          "c4",
          "c8",
          "c12",
          "c13",
          "c9",
          "c10",
          "c6",
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          "c3",
          "c7",
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          "c14",
          "c17",
          "c16"
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      },
      {
        "constraint": "direction:c7",
        "path": [
          "c0",
          "c1",
          "c2",
          "c3",
          "c7",
          "c6",
          "c5",
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          "c9",
          "c10",
          "c11",
          "c15",
          "c14",
          "c17",
          "c16"
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      },
      {
        "constraint": "direction:c9",
        "path": [
          "c0",
          "c1",
          "c2",
          "c3",
          "c7",
          "c11",
          "c15",
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          "c6",
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      "c4 在第 16 步，必须右与下",
      "c7 在第 5 步，必须上下直行",
      "c9 在第 12 步，必须右与下"
    ],
    "keyFork": {
      "step": 3,
      "correct": "c2",
      "tempting": "c5"
    },
    "reason": "进出方向不符",
    "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": "08",
      "mode": "direction",
      "geometry": "square",
      "difficulty": "难",
      "title": "起点未知：由通道反推完整路线",
      "caption": "",
      "cells": [
        {
          "id": "c0",
          "x": 0,
          "y": 0,
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        },
        {
          "id": "c1",
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          "y": 0,
          "w": 1,
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          "direction": "lr"
        },
        {
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          "y": 0,
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        },
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        },
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          "y": 2,
          "w": 1,
          "h": 1,
          "direction": "du"
        },
        {
          "id": "c10",
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          "y": 2,
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        },
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          "w": 1,
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        },
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          "y": 3,
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        },
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          "y": 3,
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          "w": 1,
          "h": 1,
          "direction": "ru"
        },
        {
          "id": "c17",
          "x": 1,
          "y": 4,
          "w": 1,
          "h": 1
        },
        {
          "id": "c18",
          "x": 2,
          "y": 4,
          "w": 1,
          "h": 1,
          "direction": "lu"
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      "c6",
      "c10",
      "c11",
      "c15",
      "c14",
      "c18",
      "c17",
      "c16",
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      "c8",
      "c4",
      "c0",
      "c1",
      "c2",
      "c3",
      "c7"
    ],
    "witnesses": [
      {
        "constraint": "direction:c1",
        "path": [
          "c2",
          "c3",
          "c7",
          "c6",
          "c10",
          "c11",
          "c15",
          "c14",
          "c18",
          "c17",
          "c16",
          "c12",
          "c8",
          "c4",
          "c0",
          "c1",
          "c5",
          "c9",
          "c13"
        ]
      },
      {
        "constraint": "direction:c9",
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          "c1",
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          "c3",
          "c7",
          "c11",
          "c15",
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          "c8",
          "c4",
          "c5",
          "c6",
          "c10",
          "c9",
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      },
      {
        "constraint": "direction:c16",
        "path": [
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          "c17",
          "c18",
          "c14",
          "c15",
          "c11",
          "c10",
          "c6",
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          "c5",
          "c9",
          "c13",
          "c12",
          "c8"
        ]
      },
      {
        "constraint": "direction:c18",
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          "c5",
          "c9",
          "c13",
          "c14",
          "c15",
          "c11",
          "c10",
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          "c17",
          "c18"
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      }
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      "c9 在第 2 步，必须上下直行",
      "c16 在第 11 步，必须上与右",
      "c18 在第 9 步，必须左与上"
    ],
    "keyFork": {
      "step": 1,
      "correct": "c13",
      "tempting": "c2"
    },
    "reason": "进出方向不符",
    "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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]