Game guide · TIANNBO
Tower of Hanoi: rules and examples
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. Keep the goal in mind before your next move. 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 with a purpose
Take a moment to check the current turn. An empty tower accepts any disc; an occupied tower accepts only a smaller disc than its top disc. Keep the goal in mind before your next move.
What you are aiming for
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. The game area remains available above the explanation.
From the start of a round
- 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.
How your actions work
The board gives you the information needed for the next action. Tap the source tower and then its destination. Tap the selected tower again to cancel the selection. The game area remains available above the explanation.
Learn from a sample situation
A careful first move helps you understand the round. Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves.
A useful caution
Only the top disc can leave a tower. Moving a large disc onto a small disc is rejected. Keep the goal in mind before your next move.
More answers before you play
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. Use the labelled controls for your next action.
When I start, how do the controls work?
Tap the source tower and then its destination. Tap the selected tower again to cancel the selection. Scores here do not represent cash or prizes.
During a round, can you show an example?
Three discs can be transferred in seven legal moves. Four discs need at least fifteen moves. You can start a new round from the game controls.
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. The instructions above use these same rules.
When I start, 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 instructions above use these same rules.
When I start, how many people can play here?
Solo. This is local browser play, not internet matchmaking. The game is played locally in your browser.
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. A new round resets the current game.
During a round, can I move several discs together?
No. One top disc moves at a time. The instructions above use these same rules.
What does Undo do?
It restores the immediately previous puzzle state and move count. Keep the current game state in view while applying this rule.
For this game, can I use the middle tower?
Yes. It is a temporary holding tower needed to move the stack legally. Scores here do not represent cash or prizes.
