Game guide · HNSZDS
Tower of Hanoi: how a round works
Use the controls beside the game rather than guessing the rules. 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. 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.
Build familiarity through play
Use the controls beside the game rather than guessing the rules. 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
A careful first move helps you understand the round. Move the complete stack of discs from the left tower to the right tower without placing a larger disc on a smaller one. Try the rule on the board, then read the next instruction.
Making your moves
- 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.
Choosing and moving on screen
Begin with the basic rule, then follow the result of your action. Tap the source tower and then its destination. Tap the selected tower again to cancel the selection. Start a new round when you are ready to try again.
Try this example
The example and rules describe the same game you can play above. Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves.
Avoid this misunderstanding
Read the position before choosing your next action. 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.
More answers before you play
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.
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. A new round resets the current game.
On this page, which mistake should I avoid?
Only the top disc can leave a tower. Moving a large disc onto a small disc is rejected. A new round resets the current game.
During a round, 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. Scores here do not represent cash or prizes.
When I start, how many people can play here?
Solo. This is local browser play, not internet matchmaking. Keep the current game state in view while applying this rule.
On this page, 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.
During a round, can I move several discs together?
No. One top disc moves at a time. No download or player account is required.
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.
During a round, can I use the middle tower?
Yes. It is a temporary holding tower needed to move the stack legally. The instructions above use these same rules.
