Level 220 solution

Solver-verified route

1. Tap Screw 3.
2. Tap Screw 2.
3. Tap Screw 1.
4. Tap Screw 4.
5. Tap Screw 5.
6. Tap Screw 6.
7. Tap Screw 7.
8. Tap Screw 8.
9. Tap Screw 9.
10. Tap Screw 10.
11. Tap Screw 11.
12. Tap Screw 12.
13. Tap Screw 13.
14. Tap Screw 14.
15. Tap Screw 15.
16. Tap Screw 16.
17. Tap Screw 17.
18. Tap Screw 18.
19. Tap Screw 19.
20. Tap Screw 20.
21. Tap Screw 21.
22. Tap Screw 22.
23. Tap Screw 23.
24. Tap Screw 24.
25. Tap Screw 25.
26. Tap Screw 26.
27. Tap Screw 27.
28. Tap Screw 28.
29. Tap Screw 29.
30. Tap Screw 30.
31. Tap Screw 31.
32. Tap Screw 32.
33. Tap Screw 33.
34. Tap Screw 34.
35. Tap Screw 35.
36. Tap Screw 36.
37. Tap Screw 37.
38. Tap Screw 38.
39. Tap Screw 39.
40. Tap Screw 40.
41. Tap Screw 41.
42. Tap Screw 42.
43. Tap Screw 43.
44. Tap Screw 44.
45. Tap Screw 45.
46. Tap Screw 46.
47. Tap Screw 47.
48. Tap Screw 48.

This route holds the buffer tray at a peak of 2 screws (the 3-star limit is 2). Solver difficulty score: 21.1.