Is using Undo cheating?
There is no Mahjong police. Whether Undo is cheating comes down to what you are playing for, and for most people it is simply a smart way to learn.
Why Undo is not cheating
Undo turns a game into something you can study. When you rewind a move that got you stuck, you see exactly why it failed, and next time you avoid it. For learning a new layout or getting comfortable with the free-tile rule, Undo shortens the path from confused to confident.
When you might skip it
If you want a clean measure of your skill, play a board start to finish with no Undo, no hints, and no shuffle, especially on the daily challenge or in a multiplayer race, where one confident run is the whole point. That is a personal choice, not a rule the game enforces.
What the leaderboard rewards
Ranked times naturally favor clean solves, because hesitating, undoing, and re-planning all cost seconds. So even though Undo is always available, the leaderboard quietly rewards the players who rarely need it.
Related questions
What is a hint in Mahjong Solitaire?
A hint highlights a pair of free tiles that you can legally match right now. It is a helper for when you are stuck or cannot spot a move, showing you one valid option without solving the whole board for you. Using hints is optional and does not end your game.
Can you shuffle tiles in Mahjong Solitaire?
Yes. Shuffle takes the tiles still left on the board and rearranges them into a new pattern, which is a lifesaver when you hit a gridlock. It reopens matches so a stuck board does not have to end your game. On Mahjong.now the reshuffled board stays solvable.
How do you get better at Mahjong Solitaire?
Improve by building three habits: scan the whole board before you click, open the tallest and most-covered stacks first, and avoid removing pairs you might still need. Watch out for two matching tiles stacked on top of each other, since clearing one can trap the other.
How is Mahjong Solitaire scored?
Most Mahjong Solitaire scoring is based on how fast you clear the board, so a quicker finish ranks higher. Some modes also count how many tiles you remove and subtract points for using hints, undos, or shuffles, which rewards clean, unassisted play.