How it plays / 23 September 2026
How the chain reaction works
Every board is a queue. A bus only leaves when it is full, and the bus in front decides when that can happen.
The front of the queue matters
Vehicles sit nose to tail, and a full bus still cannot move if something is blocking the lane ahead of it. So the interesting decision is rarely “which passenger goes where” on its own — it is which bus you can free first, because clearing the front of a queue releases everything behind it.
That is where the chain comes from. One clear move opens a lane, the next bus completes, and the board unwinds a little further than you expected.
Reading a board
Count what each colour still needs. A bus has one seat per cell of its length, so a three-cell bus wants three passengers of its own colour and nothing else. When a colour is over-subscribed, look at what is parked in front of the buses holding the spares.
Powers exist for the moments the board locks up: bring two passengers together, run a smart sequence of exchanges, or lift a ready bus out of a blocked spot. They are there to reopen a route, not to skip the puzzle.