Game guide · JK-TJ
Rules, controls and help for Water Jug Puzzle
Begin with the basic rule, then follow the result of your action. 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.
Six verified solvable capacity puzzles, with undo and move count. These are six levels of one game, not six separate games.
Something to practise
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 objective of a round
Take a moment to check the current turn. Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. Keep the goal in mind before your next move.
Step by step
- 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.
Choosing and moving on screen
The example and rules describe the same game you can play above. 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.
Put the rules into context
Keep the goal in view while choosing a move. 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.
Pay attention to this rule
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.
If you are unsure
For this game, what is the aim of Water Jug Puzzle?
Measure the target number of litres using two unmarked jugs and only filling, emptying and pouring. No download or player account is required.
For this game, 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. The instructions above use these same rules.
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. The controls work with mouse or touch.
During a round, which mistake should I avoid?
You cannot measure a partial fill directly. Only the allowed actions can create a quantity. The worked example offers another way to follow the rule.
On this page, 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. The instructions above use these same rules.
For this game, how many people can play here?
Solo. This is local browser play, not internet matchmaking. You can start a new round from the game controls.
On this page, where must the target volume end up?
In either jug. The other jug may contain any legal amount. Scores here do not represent cash or prizes.
When I start, can I stop a pour halfway?
No. The source must empty or the destination must fill. Scores here do not represent cash or prizes.
During a round, why is an action disabled?
It would not change the current jug contents, such as filling a full jug. Use the labelled controls for your next action.
On this page, how many puzzles are included?
Six capacity-and-target combinations are selectable on the board. No download or player account is required.
