← Your path
Four unmarked vessels
Your goal
Leave exactly 3 litres in each of three vessels. The fourth must be empty.
▤ Your first notebook · Statement, rules and controls
The challenge
You have four unmarked vessels with capacities of 9, 7, 4 and 2 litres. Initially, the 9-litre vessel is full and the other three are empty.
- Pour from one vessel into another until the source empties or the destination fills.
- You cannot stop a pour early, estimate a quantity, add liquid or discard it. The total always remains 9 litres.
How to play
First select the vessel to pour from, then the one receiving the liquid. The board calculates the allowed pour. Use “Undo pour” to reverse your last step.
Hints are optional. Reading an explanation does not complete the level: test your strategy on the board.
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