Fluid Gates
A network of tanks joined by one-way pipes, each with a valve. Every tick, open pipes move up to their rate. Get the marked tanks to their target levels — then close every valve.
Open and close valves to move whole units of liquid until the marked tanks hold their targets.
FreeOn this device
Orange dashes mark targets. This is a transport puzzle in whole units — no pressure or flow physics.
Valves
Tanks
- A: 5 / 7 (target 3)
- B: 0 / 6 (target 2)
- C: 3 / 12
Tick 0 · paused · 0 valves open · 0 wasted.
Controls
- Toggle a valve with its button in the Valves list (Tab and Enter or Space work too).
- Run 1 tick advances once; Run continuously ticks once per second until you Pause. Reset puts every tank back.
- Free experiment hides the targets so you can explore a network.
The rules
- Each open pipe moves up to its rate per tick, but never more than its source held at the start of the tick.
- A tank accepts only what fits in the space it had at the start of the tick; pipes are served in pipe-number order. What is refused stays where it was.
- Everything moves at the same moment, so liquid can never pass through two tanks in one tick. A drain keeps everything it receives as waste.
Scoring, saving and limits
A network is solved when every target is met and every valve is closed. Less waste is better, then fewer ticks; each network shows a reference result.
Your tank levels, valves, mode and best results are kept on this device only. Download a backup to move them.
Whole units only. This is a transport puzzle, not a model of pressure, head loss or real fluid flow.
Questions
- Why didn't the liquid go straight through the middle tank?
- Each tick works from the volumes at its start, so liquid arriving in a tank this tick can only leave it next tick.
- Why must the valves be closed to finish?
- Otherwise the next tick would change the levels again — a target is only met if it stays met.
- Is the reference the best possible?
- No claim is made. It is one schedule known to work; beat it if you can.