贪吃蛇规划：最近的苹果为什么害了我？Snake Planning: Why Did the Nearest Apple Trap Me?
模拟一次移动和吃食物后的身体，区分现在合法、下一步有出口、长远一定安全三种不同结论。Simulate a move and growth, distinguishing legal now, having a next exit and guaranteed long-term safety.
先在纸上猜结果，再按按钮检验。Predict on paper before checking with the buttons.
这是无对手、无穿越、无新食物刷新的单蛇课堂棋盘。空间法只在每个候选下一状态上做快照搜索，不是完整未来规划器；原多人游戏还有同步移动与其他模式。This is a single-snake board without opponents, pass-through modes or food respawning. Space planning searches a snapshot after each candidate move, not the entire future; the original multiplayer game has simultaneous movement and additional modes.