Level 48 solution

Solver-verified route

1. Place the stack from Slot 1 onto hex (0, -1).
2. Place the stack from Slot 2 onto hex (1, 1).
3. Place the stack from Slot 1 onto hex (1, 0).
4. Place the stack from Slot 3 onto hex (-1, 0).
5. Place the stack from Slot 2 onto hex (0, -2).
6. Place the stack from Slot 2 onto hex (0, 0).
7. Place the stack from Slot 3 onto hex (1, -2).
8. Place the stack from Slot 1 onto hex (0, 2).
9. Place the stack from Slot 2 onto hex (1, -2).

The solver clears this board in 9 placements. Hex coordinates are axial (q, r) from the board center.