Game guide · PYZSB
Read before your next round of Tower of Hanoi
Check the rule below as you play. Move the complete stack of discs from the left tower to the right tower without placing a larger disc on a smaller one. Keep the goal in mind before your next move. Choose three to eight discs. All discs begin on the left tower. Keep the goal in mind before your next move.
One puzzle with adjustable disc count from three to eight. Disc counts are settings, not separate game entries. Undo is available; refreshing restarts.
A small practice goal
The board gives you the information needed for the next action. An empty tower accepts any disc; an occupied tower accepts only a smaller disc than its top disc.
What counts as success
Begin with the basic rule, then follow the result of your action. Move the complete stack of discs from the left tower to the right tower without placing a larger disc on a smaller one.
The playing sequence
- Choose three to eight discs. All discs begin on the left tower.
- Select the source tower, then the destination tower. Only the top disc moves.
- An empty tower accepts any disc; an occupied tower accepts only a smaller disc than its top disc.
- Use Undo to reverse a move. Complete the puzzle when the right tower holds the whole stack.
Getting comfortable with the controls
Take a moment to check the current turn. Tap the source tower and then its destination. Tap the selected tower again to cancel the selection.
One way to understand the rules
Check the rule below as you play. Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves.
Check this before moving on
Keep the goal in view while choosing a move. Only the top disc can leave a tower. Moving a large disc onto a small disc is rejected. Start a new round when you are ready to try again.
A few questions answered
During a round, what is the aim of Tower of Hanoi?
Move the complete stack of discs from the left tower to the right tower without placing a larger disc on a smaller one. A new round resets the current game.
On this page, how do the controls work?
Tap the source tower and then its destination. Tap the selected tower again to cancel the selection. The worked example offers another way to follow the rule.
On this page, can you show an example?
Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves. The worked example offers another way to follow the rule.
During a round, which mistake should I avoid?
Only the top disc can leave a tower. Moving a large disc onto a small disc is rejected. Scores here do not represent cash or prizes.
For this game, what rules and limits are used here?
One puzzle with adjustable disc count from three to eight. Disc counts are settings, not separate game entries. Undo is available; refreshing restarts. Use the labelled controls for your next action.
During a round, how many people can play here?
Solo. This is local browser play, not internet matchmaking. Scores here do not represent cash or prizes.
When I start, what is the minimum number of moves?
For n discs the minimum is 2^n − 1. The board shows the minimum for your selected disc count. Keep the current game state in view while applying this rule.
On this page, can I move several discs together?
No. One top disc moves at a time. The controls work with mouse or touch.
During a round, what does Undo do?
It restores the immediately previous puzzle state and move count. Use the labelled controls for your next action.
Can I use the middle tower?
Yes. It is a temporary holding tower needed to move the stack legally. Keep the current game state in view while applying this rule.
