Game guide · VISITPHONE
The essentials of playing Water Jug Puzzle
A careful first move helps you understand the round. 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. 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.
Take a closer look while playing
Check the rule below as you play. 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 objective of a round
A careful first move helps you understand the round. Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. The game area remains available above the explanation.
A walkthrough of the rules
- 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.
Keyboard and screen controls
The board gives you the information needed for the next action. Use Fill A, Fill B, Empty A, Empty B, Pour A → B and Pour B → A. The display shows current and maximum litres. Keep the goal in mind before your next move.
Try this example
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. The game area remains available above the explanation.
A mistake to avoid
The example and rules describe the same game you can play above. You cannot measure a partial fill directly. Only the allowed actions can create a quantity. Start a new round when you are ready to try again.
More answers before you play
On this page, what is the aim of Water Jug Puzzle?
Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. You can start a new round from the game controls.
When I start, 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.
On this page, 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.
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. No download or player account is required.
On this page, how many people can play here?
Solo. This is local browser play, not internet matchmaking. Use the labelled controls for your next action.
For this game, where must the target volume end up?
In either jug. The other jug may contain any legal amount. No download or player account is required.
During a round, 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.
For this game, why is an action disabled?
It would not change the current jug contents, such as filling a full jug. The worked example offers another way to follow the rule.
When I start, how many puzzles are included?
Six capacity-and-target combinations are selectable on the board. The worked example offers another way to follow the rule.