把原理，放进实验。Put ideas into play.

选一种线路颜色，再依次点击车站；也可从线路端点拖到另一站。每条线最多4站，3条线各有一列4座列车，另有一列备用车。乘客的小图形就是目的地车站的形状。只有共用车站才能换乘，线条交叉不算连接。第二、三关的新站按城市时序出现，地图上的河流固定，每局最多两处跨河线段；撤回释放额度。Choose a line, then tap stations in sequence; or drag from a line endpoint to another stop. Each of three lines holds up to four stops and has a four-seat train, plus one spare train. Passenger shapes are their destination types. Transfers need a shared station; crossing lines alone do not connect. In later challenges stops appear on the city schedule. The fixed river allows two crossing segments across all routes; undo releases a crossing.

站台达到8人会开始承压，少于8人时压力逐步回落；承压计时累计到10秒则全网停摆。可暂停改线、撤回一个站、给所选线路加车；改线时车内乘客回到最后出发站重新候车，不会凭空送达。车站按钮支持Enter/Space，1–3切换线路，Esc取消拖线。暂停后可逐秒推演。A queue of eight builds overload pressure; pressure eases below eight. The network stops when accumulated pressure reaches ten seconds. Pause to edit, undo a stop or add the spare train. Editing returns onboard riders to their last departure station; it never delivers them for free. Enter/Space selects stops, 1–3 selects lines, Esc cancels dragging. Step advances one second while paused.

本局可主动让D站停运12秒，观察其他站的积压。若有绕行路径，影响会不同；也可使用本局唯一一次抢修。第二、三关会在指定时刻自动停运D站。Close D for 12 seconds once per round and watch upstream queues. A bypass changes the impact. Each round also has one repair. Challenges two and three include a scheduled D outage.

城市是路网之外的母系统：第二、三关由既定城市时序产生新站，河道限制跨越次数，高峰客流与枢纽停运也不由玩家推迟。你调整的是内部连接与运力，目标是让网络适应给定环境。站点出现的时刻可预知，重试保持相同时序，便于比较策略。这是天生人原理的局部游戏类比，不是现实城市、天地或人体的模型。The city is the network's surrounding system. Later challenges introduce stops on a fixed city schedule. The river limits crossings; demand peaks and outages cannot be delayed. You adjust internal routes and capacity to fit those conditions. Growth is announced and repeats on retry so strategies can be compared. This is a playful analogy for adaptation within a parent system, not a physiological or city model.

参考Mini Metro与Mini Motorways的连线调度思路，地图、关卡与界面独立制作。Inspired by the network play of Mini Metro and Mini Motorways, with original maps, challenges and interface.