1. Launch the Block 3D game on your mobile device.

2. Observe the moving block at the top of the screen. It will slide back and forth horizontally above a stationary block.

3. Tap the screen at the right moment to drop the moving block. Your goal is to align it as closely as possible with the block below.

4. If the block lands perfectly aligned, the size stays the same and the next moving block continues as before.

5. If the dropped block is not perfectly aligned, the overhanging portion is sliced off, and the remaining part becomes the new base for the next block.

6. With each successful drop, the game becomes more challenging, as the block becomes smaller and harder to align.

7. Continue tapping to stack as many blocks as possible, aiming to build the tallest tower.

8. The game ends when you fail to land a block on the previous one and there is no surface left to stack.

9. Try to beat your highest score by improving your timing and precision with each play.

10. Enjoy the vivid colors, smooth animations, and relaxing sound effects as you test your spatial awareness and reaction speed.