Loop Sort level guide
Loop Sort Level 521 Walkthrough
Loop Sort Level 521 has three top sources, exactly two middle sources, and four lower sources hidden by the second shutter. Start with M1 light blue, M2 pink, and the M1 green key. Finish with T3 light blue, B2 brown, B1 red, and B4 orange.
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How to Solve Loop Sort Level 521 — Full Solution
- Tap M1 light blue.
- Tap M2 pink.
- Tap M1 green with the key marker.
- Tap T1 green after the first curtain retracts.
- Tap T1 gray.
- Tap M2 pink.
- Tap T1 pink.
- Tap M2 gray.
- Tap M1 green.
- Tap T2 blue.
- Tap M2 pink.
- Tap T1 gray.
- Tap T1 pink and confirm T1 checks.
- Tap T2 blue.
- Tap T3 yellow.
- Tap M1 green and confirm M1 checks.
- Tap T3 light blue.
- Tap M2 pink and confirm M2 checks.
- Wait for the orange shutter to retract and expose B1, B2, B3, and B4.
- Tap B3 gray.
- Tap B1 orange.
- Tap B2 red.
- Tap B2 light blue.
- Tap B4 yellow.
- Tap T2 blue and confirm T2 checks.
- Tap B3 gray and confirm B3 checks.
- Tap T3 light blue and confirm T3 checks.
- Tap B2 brown and confirm B2 checks.
- Tap B1 red and confirm B1 checks.
- Tap B4 orange and confirm B4 checks.
- Verify all nine checks, an empty route at 0/6, and the completion card.
Colors in this level:
Light blue, Green, Pink, Gray, Blue, Yellow, Orange, Red, Brown
Common Mistakes to Avoid
- Counting the large green curtain as a third middle source.
- Tapping a lower position before the orange shutter retracts.
- Changing the final sequence after T3 light blue.
Quick Tips for Loop Sort Level 521 (quick clues)
- Use T1, T2, T3, M1, M2, and B1 through B4 as fixed position labels.
- Treat each layer change at one position as a turnover of the same source.
- Wait for the orange shutter to finish retracting before assigning the new B1-B4 coordinates.
Board notes 5 details
- Layout
- T1 through T3 form the top row, M1 and M2 are the only sources inside the clockwise loop, and B1 through B4 appear after the lower shutter retracts. The large green block beside M1 is a lock curtain, not a source.
- Goal
- Clear all nine sources and finish the exact last sequence T3 light blue, B2 brown, B1 red, B4 orange before the route reaches 0/6.
- Opening
- Tap M1 light blue, M2 pink, and M1 green with the key marker. The key retracts the first curtain and makes T1 through T3 usable.
- Danger Zone
- Do not count the large green curtain as a tappable source. Do not start B1 through B4 until the orange lower shutter has fully retracted.
- Mechanics
- The M1 key opens the top phase. Later checks retract the orange shutter and reveal four numbered lower sources with covered turnovers.
Frequently Asked Questions
How many middle sources does Loop Sort Level 521 have?
It has exactly two, M1 on the left and M2 on the right. The large green block is a curtain.
What does the orange shutter reveal in Level 521?
It reveals four separate lower sources, numbered B1 through B4 from left to right.