Step 1: Understand the level objective and layout.
Observe the starting position of red and blue sand, and the target red and blue containers.
Mentally identify the paths each sand color needs to take.
Complete walkthrough and strategy guide for Sand Loop Level 21. Watch the video tutorial and learn expert tips to beat this level.

Watch this video walkthrough to learn how to beat Sand Loop Level 21. Follow the step-by-step solution.
Master Sand Loop Level 21 with our complete walkthrough. This beginner level typically takes 1–2 min to complete. Find tips, video guides, and strategies for this puzzle level.
Guide red and blue sand into their respective containers by drawing a single diagonal line to split their flow.
| Time | Scene | Action | Common Error | Confidence |
|---|---|---|---|---|
| 00:00 | Level start | Overview of the puzzle setup showing red and blue sand piles and their corresponding containers. | 100% | |
| 00:02 | Drawing line starts | Player begins drawing a line on the screen. | 100% | |
| 00:04 | Line drawing complete | Player finishes drawing a diagonal line from the top-left to the bottom-right, splitting the potential sand path. | 100% | |
| 00:05 | Sand flow begins | The sand starts to fall, guided by the drawn line. | 100% | |
| 00:25 | All sand settled | All red and blue sand has successfully reached their respective colored containers. | 100% | |
| 00:28 | Level Clear! | The 'Level Clear!' screen appears, indicating successful completion of the puzzle. | 100% |
Observe the starting position of red and blue sand, and the target red and blue containers.
Mentally identify the paths each sand color needs to take.
Draw a single, slightly curved diagonal line from the top-left part of the screen, just above the sand, extending down towards the bottom-right. The line should effectively divert red sand to the left container and blue sand to the right container.
The sand starts flowing correctly, with red sand moving left and blue sand moving right, without mixing.
Wait for all the red and blue sand to fully settle into their designated containers.
The 'Level Clear!' screen appears, confirming successful completion.
Sand of different colors mixes or goes into the wrong container.
Fix: Adjust the angle and curvature of the drawn line to create a clearer separation and guide each color more precisely to its target.
Evidence Time: N/A
Not enough sand reaches a container, or some sand gets stuck.
Fix: Ensure the drawn line is long enough and positioned accurately to fully capture and guide all the sand stream without leaving gaps or creating obstructions.
Evidence Time: N/A
Q: How do I separate the red and blue sand effectively?
A: Draw a single, slightly curved diagonal line starting from above the sand pile, guiding the red sand to the left and the blue sand to the right, into their respective containers. The key is precise placement and angle.
Q: What if my line doesn't work and the sand mixes?
A: The line needs to create a distinct barrier and ramp for each color. Try making the line longer or adjusting its curve to ensure a clean separation and flow, preventing any mixing or spillage.

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