Choose a problem. Start thinking.
The five mansion trials, with touch and keyboard boards. Choose any: attempts save separately and do not unlock the adventure.
With family or in class ↗FREE PRACTICE
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13 independent crossing, pouring, pattern and proof problems. Choose one and return whenever you like.
- The ferryman and his three passengersAvailable · Choose freely
- Dividing the reserveAvailable · Choose freely
- The undersized boatAvailable · Choose freely
- The hundred-door corridorAvailable · Choose freely
- The copper bridgeAvailable · Choose freely
- Nine stones, no returnAvailable · Choose freely
- One extra passengerAvailable · Choose freely
- The stone bridgeAvailable · Choose freely
- The board with two missing cornersAvailable · Choose freely
- Ten litres and a decisionAvailable · Choose freely
- The fifth travellerAvailable · Choose freely
- The final reserveAvailable · Choose freely
- Under the final archAvailable · Choose freely