🧩 Classic 15-Puzzle

The 15-Puzzle (also called Gem Puzzle or Sliding Puzzle) is a classic puzzle invented in 1874. The goal is to arrange 15 numbered tiles in a specific order by sliding them into the empty space.

How to Play:

• Click any tile adjacent to the empty space to slide it
• Only tiles directly next to the empty space (up, down, left, right) can move
• Arrange all tiles to match the selected goal pattern

Goal Patterns:

• Row by Row: Numbers flow left-to-right, top-to-bottom (1-2-3-4, 5-6-7-8, ...)
• Column by Column: Numbers flow top-to-bottom, left-to-right (1-5-9-13, 2-6-10-14, ...)
• Snake (Horizontal): Numbers snake left-right-left (1-2-3-4, 8-7-6-5, 9-10-11-12, ...)
• Snake (Vertical): Numbers snake top-bottom-top in columns
• Spiral (Clockwise): Numbers spiral inward clockwise from top-left
• Spiral (Counter-CW): Numbers spiral inward counter-clockwise
• Free Mode: No goal - play however you like!

Tips: Work on solving one row or column at a time. The last two rows are trickiest - learn the rotation technique to move tiles without disturbing solved areas.