text: function setElemPos(elem, left, top) {
    elem.style.left = `${left}px`;
    elem.style.top = `${top}px`;
  }
  
  class Door {
    constructor(left, top, blockIdx, targetBlockIdx, targetDoorIdx) {
      this.left = left
      this.top = top
      this.blockIdx = blockIdx
      this.target = {blockIdx : targetBlockIdx, doorIdx: targetDoorIdx}
  
      const elem = document.createElement("div");
      elem.classList.add("door");
      elem.onclick = () => this.onclick()
      setElemPos(elem, left, top)
      this.elem = elem
    }
  
    onclick() {
      if (MOUSE.isInTransition() || MOUSE.blockIdx != this.blockIdx) return;
      MOUSE.moveByX(this.left - MOUSE.left, () => {
        MOUSE.moveToDoor(this.target.blockIdx, this.target.doorIdx)
        MOUSE.orientToHint()
      })
    }
  }
  
  class Mouse {
    constructor() {
      this.elem = document.createElement("div")
      this.elem.classList.add("mouse")
      const mouseImg = document.createElement("div")
      mouseImg.classList.add("mouse-img")
      this.mouseImg = mouseImg
      this.elem.appendChild(mouseImg)
  
      this.transition = null;
      this.blockIdx = this.left = this.top = NaN
      this.moveToDoor(0, 0)
      this.setRightFace()
    }
  
    moveToDoor(blockIdx, doorIdx) {
      this.blockIdx = blockIdx
      const d = BLOCKS[this.blockIdx].doors[doorIdx]
      this.left = d.left
      this.top = d.top
      setElemPos(this.elem, d.left, d.top)
    }
  
    isInTransition() {
      return this.transition !== null
    }
  
    moveByX(diff, clbk) {
      const orig = this.left
      const inc = (diff < 0) ? -1 : 1
      if (inc > 0) this.setMovingRight()
      else this.setMovingLeft()
  
      this.transition = setInterval(() => {
        if (this.left == orig + diff) {
          clearInterval(this.transition)
          clbk()
          this.transition = null
          return
        }
        this.left += inc
        setElemPos(this.elem, this.left, this.top)
      }, 5)
    }
  
    clearImg() {
      this.mouseImg.classList.remove("mouse-right", "mouse-left", "mouse-right-mov", "mouse-left-mov");
    }
    setRightFace() {
      this.clearImg()
      this.mouseImg.classList.add("mouse-right");
    }
  
    setLeftFace() {
      this.clearImg()
      this.mouseImg.classList.add("mouse-left");
    }
  
    setMovingRight() {
      this.clearImg()
      this.mouseImg.classList.add("mouse-right-mov")
    }
  
    setMovingLeft() {
      this.clearImg()
      this.mouseImg.classList.add("mouse-left-mov")
    }
  
    orientToHint() {
        const block = BLOCKS[this.blockIdx]
        if (this.left > block.doors[block.correctDoor].left + 25) MOUSE.setLeftFace()
        else MOUSE.setRightFace()
    }
  }
  
  class Block {
    constructor(coords, doors, correctDoor, blockIdx) {
      this.left = coords[0]
      this.top = coords[1]
      this.width = coords[2]
      this.height = coords[3]
      this.idx = blockIdx
      this.correctDoor = correctDoor
  
      const elem = document.createElement("div");
      elem.classList.add("block");
      // this.elem.onclick = () => { MOUSE.moveToDoor(DOORS[target].left, DOORS[target].top)}
      setElemPos(elem, this.left, this.top)
      elem.style.width = `${this.width}px`
      elem.style.height = `${this.height}px`
      elem.onclick = (e) => this.onclick(e)
      this.elem = elem
  
      this.doors = doors.map(x => new Door(x[0], this.top, this.idx, x[1], x[2]))
    }
  
    onclick(e) {
      if (MOUSE.isInTransition() || MOUSE.blockIdx != this.idx) return;
      const blockRect = this.elem.getBoundingClientRect()
      const mouseRect = MOUSE.elem.getBoundingClientRect()
      const mouseDiff = e.pageX - mouseRect.x
      MOUSE.moveByX(mouseDiff, () => MOUSE.orientToHint())
    }
  }
  
  const BLOCKS_RAW = [
    {
      coords: [130, 65, 50, 50],
      doors: [[130, 3, 1]],
    },
    {
      coords: [291, 65, 340, 50],
      doors: [[320, 16, 0], [420, 14, 2], [560, 13, 0]],
    },
    {
      coords: [822, 65, 191, 50],
      doors: [[955, 18, 1]],
    },
    {
      coords: [67, 140, 450, 50],
      doors: [[97, 1, 1], [292, 7, 1], [443, 14, 0]],
    },
    {
      coords: [771, 140, 316, 50],
      doors: [[850, 1, 2], [1005, 20, 0]],
    },
    {
      coords: [67, 205, 100, 50],
      doors: [[97, 4, 1]],
    },
    {
      coords: [262, 205, 281, 50],
      doors: [[300, 2, 0], [427, 6, 0]],
    },
    {
      coords: [671, 205, 419, 50],
      doors: [[723, 8, 3], [838, 8, 1], [1006, 4, 0]],
    },
    {
      coords: [120, 271, 637, 50],
      doors: [[128, 12, 1], [254, 7, 2], [355, 10, 3], [487, 16, 2], [637, 9, 0]],
    },
    {
      coords: [913, 271, 170, 50],
      doors: [[952, 20, 2]],
    },
    {
      coords: [57, 330, 437, 50],
      doors: [[74, 11, 0], [189, 7, 0], [289, 12, 0], [420, 13, 0]],
    },
    {
      coords: [575, 330, 78, 50],
      doors: [[592, 17, 1]],
    },
    {
      coords: [763, 330, 331, 50],
      doors: [[771, 10, 1], [871, 11, 0], [1027, 15, 0]],
    },
    {
      coords: [66, 396, 105, 50],
      doors: [[102, 1, 0]],
    },
    {
      coords: [269, 396, 489, 50],
      doors: [[289, 17, 0], [400, 8, 4], [499, 3, 1], [632, 3, 2]],
    },
    {
      coords: [882, 396, 208, 50],
      doors: [[905, 10, 0], [1008, 19, 1]],
    },
    {
      coords: [54, 468, 300, 50],
      doors: [[77, 8, 0], [160, 10, 2], [278, 14, 3]],
    },
    {
      coords: [455, 463, 251, 50],
      doors: [[475, 3, 0], [611, 7, 2]],
    },
    {
      coords: [794, 461, 302, 50],
      doors: [[812, 21, 0], [1012, 15, 0]],
    },
    {
      coords: [53, 538, 243, 50],
      doors: [[74, 19, 0], [222, 6, 0]],
    },
    {
      coords: [400, 533, 340, 50],
      doors: [[404, 5, 0], [515, 16, 1], [638, 8, 2]],
    },
    {
      coords: [840, 532, 270, 50],
      doors: [[845, 0, 0]],
    },
  ]
  
  const BLOCKS = computeAnswer(BLOCKS_RAW).map((x, idx, _arr) => new Block(x.coords, x.doors, x.correctDoor, idx))
  
  const MOUSE = new Mouse()
  
  // Reverses graph and does a BFS from the finish.
  function computeAnswer(blocks_raw) {
    const reverse = blocks_raw.map(block => ({
      doors: [],
      idx: block.idx,
      visited: false
    }) )
  
    for (const [blockIdx, block] of blocks_raw.entries()) {
      for (const [doorIdx, door] of block.doors.entries()) {
        reverse[door[1]].doors.push({blockIdx, doorIdx})
      }
    }
  
    const q = [{toBlock: blocks_raw.length - 1, toDoor: 0}]
  
    while (q.length != 0) {
      const cur = q.shift()
      const b = reverse[cur.toBlock]
      if (b.visited) continue
      b.visited = {toDoor: cur.toDoor}
      for (const [doorIdx, door] of b.doors.entries()) {
        q.push({fromDoor: doorIdx, toBlock: door.blockIdx, toDoor: door.doorIdx})
      }
    }
  
    return blocks_raw.map((x, idx) => Object.assign({correctDoor: reverse[idx].visited.toDoor}, x))
  }
  
  function hihi() {
    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+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]])+[])[+!+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]]+![]+(![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]])()[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]])+[])[+!+[]]+[+!+[]]+[+!+[]]+[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(+[![]]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+!+[]]]+([][(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()+[])[!+[]+!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(+[![]]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+!+[]]]+(+(!+[]+!+[]+[+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+[+!+[]])+([][[]]+[])[+[]]+([][[]]+[])[+!+[]]+(![]+[+[]]+([]+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+(![]+[])[+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(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  }
  
  function renderEmpty() {
    const gameboard = document.getElementById("gameboard");
    for (const block of BLOCKS) {
      gameboard.appendChild(block.elem);
      for (const door of block.doors) {
        gameboard.appendChild(door.elem)
      }
    }
    gameboard.appendChild(MOUSE.elem)
  
    // Reset button
    const reset = document.createElement("div")
    reset.classList.add("reset")
    reset.onclick = () => { !MOUSE.isInTransition() && MOUSE.moveToDoor(0, 0)}
    gameboard.appendChild(reset)
  
    // Finish
    const finish = document.createElement("div")
    finish.classList.add("finish")
    finish.onclick = () => { !MOUSE.isInTransition() && MOUSE.blockIdx == 21 && hihi() }
    gameboard.appendChild(finish)
  }
  
  function init() {
    renderEmpty();
  }
  
  window.onload = init;
  