15-Puzzle

Goal

Slide tiles until the numbers are in order from 1 to 15.

Controls

• Tap or click a tile next to the empty space to slide it in.
• Only tiles adjacent to the blank can move.

Rules

• Arrange tiles in ascending order, left to right, top to bottom.
• The empty space finishes in the bottom-right corner.
• Fewer moves is better — chase a clean solve, not random sliding.

Tips

• Solve row by row from the top, then finish the last two rows carefully.
• Don’t break a finished row once it’s correct.