[okayama]

1st scramble: L2 U' L2 D2 B2 F2 U' F2 U R2 B2 R D2 F L U B R U2 B' L2

1st solution (1-hour): L U R2 F' L' U L U' R2 D R' U2 R D' R' B' U L' U' R' U L2 U' R B2 U2 L U (28 moves)

Spoiler (Click to View)

2x2x1 block: L U
2x2x2 block: R2 F' R
c/e pair: L'
Orient edges: U * L U B'
More square: U
More square: L U'
All but 5 corners (with 2 corners twisted in place): B2 U2 L U

Found in 20 min., worth trying 3 insertions I thought, and firstly I found:

Insert at *: U' R' U L U' R U L' (7 moves cancel)

gave the following 18-move skeleton:

All but 5 corners: L U R2 F' L' U L U' R + U2 B' U L U' % B2 U2 L U

I did one-path insertions as

Insert at +: R D R' U2 R D' R' U2
Insert at %: U L2 U' R' U L2 U' R [@1]

IF says that instead of the insertion at +,

Insert at @1: R B2 R' U2 B2 L' B2 L U2 B2

is optimal giving 27 moves, but I couldn't figure out it.

2nd scramble: R B2 D2 L B2 U2 R2 B2 D2 U L' D R D F L' F2 D2 L

2nd solution (1-hour): L' F L F' R2 D L D' R D L' D R F' U L' U' L B2 L' D' R (22 moves)

Spoiler (Click to View)

15 min solution, found almost linearly.

(Inverse)

2x2x2 block: R' D L B2
2x2x3 block: L' U L U'
F2L minus 1 slot: F R' D2 * R
All but 3 corners: F L' F' L

Insert at *: D L D' R' D L' D' R

I stopped at 30 min.
EO start D2 R F on normal also looked interesting, but no better solution was found.

3rd scramble: R2 B D2 B R2 F' L2 B' F2 R' U' L' B R' U' R F2 L

3rd solution (1-hour): L D2 L' F' L U' L' U R' B U R' B U B' R2 U R U' F' U B' U' F B U2 B' U' B2 F' (30 moves)

Spoiler (Click to View)

Pre-scramble: B F'

c/e pair: L
2x2x2 block: D2 L' F'
2x2x3 block: L U' L' U R' B
More square: U R'
More square: B U B'
All but 2c2e: R2 U R U
Swap 2c2e: U2 F' U B' U' F B U2 B' U' B
Correction: B F'