HOW STUFF WORKS
QUIZZES

Solve This! The Sliding Puzzle Quiz
by Staff
They're addictive, engrossing and maddening. Sliders have been around for well over a century, but you still may have a lot to learn about these braintwisters.

### What is the first sliding puzzle commonly known as?

• Rubik's Slider
• The 15 Puzzle
• Tic Tac Toe

• square
• triangular
• circular

### How many 15 Puzzle configurations are solvable?

• all of them
• half of them
• all except one

• 1880
• 1980
• 1890

### Who was the inventor of the 15 Puzzle?

• Sam Loyd
• Noyes Chapman
• P.T. Barnum

### How can sliding puzzle pieces be moved?

• by jumping over another piece
• by flipping them
• by moving them into an empty space

• True
• False

### Why was the Pennant Puzzle of 1909 harder to solve than earlier sliding puzzles?

• It used rectangular pieces.
• The pieces were all the same color.

• True
• False

### Ma's Puzzle, released in 1927, introduced what element into sliding puzzles?

• T-shaped pieces
• L-shaped pieces
• Z-shaped pieces

### What is the key to solving sliding puzzles?

• moving two pieces at once
• converting the puzzle to a mathematical formula
• There is no key.

### The Japanese sliding puzzle Sokoban represents what kind of worker?

• taxi dispatcher
• warehouse manager
• airline pilot

### What makes Sokoban especially difficult?

• Pieces can be pushed, but not pulled.
• The pieces are different colors.
• The game has a warp factor that randomizes the tiles.

### What professional group has a history of sliding puzzle analysis?

• mathematicians
• philosophers
• psychologists

### When mathematicians judge a puzzle PSPACE-complete, what does this mean?

• The puzzle is complex and difficult to solve.
• The puzzle has a certain number of empty spaces.
• The puzzle cannot be solved except by a computer.

### What claim is made for the computer-designed puzzle called Quzzle?

• It's a puzzle no one has ever solved.
• It's the best puzzle for a child.
• It's the most difficult simple sliding puzzle.

• 1880s
• 1960s
• 1980s

• 5 minutes
• 2.5 minutes
• 25 seconds

### What is the world's record for solving Rubik's Cube?

• 21.71 seconds
• 15.66 seconds
• 5.66 seconds

### Which renowned puzzle inventor has an annual puzzle design award named for him?

• Feliks Zemdegs
• Nob Yoshigahara
• Junk Kato
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