Game guide · GDSZY189
Rules, controls and help for 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. Start a new round when you are ready to try again. Choose three to eight discs. All discs begin on the left tower. Try the rule on the board, then read the next instruction.
One puzzle with adjustable disc count from three to eight. Disc counts are settings, not separate game entries. Undo is available; refreshing restarts.
Practice beyond the first move
The example and rules describe the same game you can play above. An empty tower accepts any disc; an occupied tower accepts only a smaller disc than its top disc. The game area remains available above the explanation.
The goal to keep in mind
The board gives you the information needed for the next action. 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.
How a round unfolds
- 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.
Input guidance
Keep the goal in view while choosing a move. Tap the source tower and then its destination. Tap the selected tower again to cancel the selection. Try the rule on the board, then read the next instruction.
See the idea in action
Keep the goal in view while choosing a move. Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves. Try the rule on the board, then read the next instruction.
Pay attention to this rule
The example and rules describe the same game you can play above. Only the top disc can leave a tower. Moving a large disc onto a small disc is rejected. The game area remains available above the explanation.
Clarifying the way this game works
For this game, 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. You can start a new round from the game controls.
For this game, 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.
For this game, can you show an example?
Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves. Use the labelled controls for your next action.
For this game, 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. The controls work with mouse or touch.
For this game, how many people can play here?
Solo. This is local browser play, not internet matchmaking. The instructions above use these same rules.
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. The instructions above use these same rules.
During a round, can I move several discs together?
No. One top disc moves at a time. The instructions above use these same rules.
For this game, what does Undo do?
It restores the immediately previous puzzle state and move count. The worked example offers another way to follow the rule.
Can I use the middle tower?
Yes. It is a temporary holding tower needed to move the stack legally. You can start a new round from the game controls.