Sliding Block Puzzles

• Sliding Block Puzzle: The 15 puzzle
  
• Sliding Block Puzzle Dad's puzzle
  
• Sliding Block Puzzle Ma's puzzle
  
• Sliding Block Puzzle Flying puzzle
  
• Sliding Block Puzzle Tit Bit puzzle

The classic 15 block puzzle solved.
The numbers are in order from 1 to 15.

Sam Loyd's 15 block puzzle that cannot be solved.
The numbers 14 and 15 were switched