Game guide · FHSYQ
A practical guide to Water Jug Puzzle
Check the rule below as you play. Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. The game area remains available above the explanation. Choose one of six capacity-and-target puzzles. Both jugs begin empty. Try the rule on the board, then read the next instruction.
Six verified solvable capacity puzzles, with undo and move count. These are six levels of one game, not six separate games.
Bring this focus to a round
Keep the goal in view while choosing a move. A pour stops when the source is empty or the destination is full. It cannot stop at an arbitrary amount. Try the rule on the board, then read the next instruction.
The goal to keep in mind
The board gives you the information needed for the next action. Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. Try the rule on the board, then read the next instruction.
From the start of a round
- Choose one of six capacity-and-target puzzles. Both jugs begin empty.
- Fill a jug to its capacity, empty it completely, or pour from one jug into the other.
- A pour stops when the source is empty or the destination is full. It cannot stop at an arbitrary amount.
- Reach the target quantity in either jug. Undo lets you try another route.
The controls to know
A careful first move helps you understand the round. Use Fill A, Fill B, Empty A, Empty B, Pour A → B and Pour B → A. The display shows current and maximum litres. Try the rule on the board, then read the next instruction.
See the idea in action
A careful first move helps you understand the round. With 3- and 5-litre jugs, fill the 5-litre jug and pour into the 3-litre jug. The 5-litre jug now contains 2 litres. Start a new round when you are ready to try again.
One detail worth checking
Use the controls beside the game rather than guessing the rules. You cannot measure a partial fill directly. Only the allowed actions can create a quantity.
Questions that come up during play
When I start, what is the aim of Water Jug Puzzle?
Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. The controls work with mouse or touch.
During a round, how do the controls work?
Use Fill A, Fill B, Empty A, Empty B, Pour A → B and Pour B → A. The display shows current and maximum litres. Scores here do not represent cash or prizes.
During a round, can you show an example?
With 3- and 5-litre jugs, fill the 5-litre jug and pour into the 3-litre jug. The 5-litre jug now contains 2 litres. A new round resets the current game.
On this page, which mistake should I avoid?
You cannot measure a partial fill directly. Only the allowed actions can create a quantity. The game is played locally in your browser.
During a round, what rules and limits are used here?
Six verified solvable capacity puzzles, with undo and move count. These are six levels of one game, not six separate games. Use the labelled controls for your next action.
On this page, how many people can play here?
Solo. This is local browser play, not internet matchmaking. Keep the current game state in view while applying this rule.
On this page, where must the target volume end up?
In either jug. The other jug may contain any legal amount. Use the labelled controls for your next action.
Can I stop a pour halfway?
No. The source must empty or the destination must fill. Keep the current game state in view while applying this rule.
On this page, why is an action disabled?
It would not change the current jug contents, such as filling a full jug. No download or player account is required.
How many puzzles are included?
Six capacity-and-target combinations are selectable on the board. The controls work with mouse or touch.