1. 1. Step 1: Observe the original picture and determine the goal of the puzzle. Rearrange the nine small pieces so that they are combined into a complete picture in the correct order. Step 2: Find the blank position. There is a blank grid in the drum tower puzzle. Find a blank position for subsequent movement.

2. Secondly, the third step: according to the blank position found in the second step, determine the small pieces that can be moved. Only the small pieces adjacent to the blank grid can be moved to the blank position. Step 4: Move the small pieces. Change the layout of the puzzle by moving a small piece to a blank position. You can move a tile horizontally or vertically.

3. Finally, step 5: Repeat steps 3 and 4 until the small pieces are correctly arranged together to form a complete original picture.