Pour & Empty
Tap an empty jug to fill it. Select a full jug to empty it or pour into another.
Exact Target
Use the capacities to create the requested amount in any one jug.
Six Challenges
Progress from easy to expert and try to solve each puzzle in fewer moves.
Measuring an exact amount with unmarked jugs is a practical test of mathematical reasoning and flexible thinking. You manage fixed capacities and search for an efficient sequence of operations.
The puzzle mirrors real situations where a goal must be reached with limited tools. It trains numerical reasoning, planning and the habit of looking for a different route when one method loops.
Measure an exact target using unmarked jugs with fixed capacities. You may fill a jug completely, empty it or pour until the source is empty or the destination is full.
Six solvable levels progress from the classic 5-litre and 3-litre problem to three-jug challenges. Your move count is the score, so finding a shorter solution matters.
Yes. All six puzzles are free and need no registration.
Create the exact target amount in any one of the available jugs.
You may fill a jug, empty it or pour into another until one jug reaches its limit.
Only multiples of the greatest common divisor of the jug capacities are possible.
Yes. All six capacity and target combinations were chosen to have a solution.
Fill the larger jug, pour into the smaller, empty the smaller and repeat in one direction.
You are in a loop. Reverse the pouring direction and track each jug amount after every move.
It trains logical reasoning, number sense, backward planning and efficient problem-solving.
Start with the classic two-jug problem and solve it in as few moves as possible.
Try more brain games or the free IQ test.