[okayama]

1st scramble: L2 D2 R2 U' F2 R2 B2 F2 R2 D2 R D' B' L F R B' U' R' U R'
1st solution: R B2 U' B U B' R B R' B2 R' U' R F' L2 B2 D U' F D F' U' F D' F' R' (26 moves)

Spoiler (Click to View)

(Inverse)
Pre-scramble: R'

1x2x3 block: R * U2 D'
2x2x3 block: B2 L2 F
F2L minus 1 slot: R' U R
Orient edges: B2 R B' R'
All but 3 corners: B U' B' U B2
Correction: R'

Insert at *: F D F' U F D' F' U'

2nd scramble: B2 R2 U B2 D R2 D' R2 U R2 D2 B L2 D2 L D' L F R' B F
2nd solution: D2 L' F L' U' B' D L2 D' B2 D' B D L B2 F D' B U' B' D2 F' D' B D F U B2 (28 moves)

Spoiler (Click to View)

Pre-scramble: F D B2

2x2x2 block: D2 L' F
2x2x3 block: L' U'
Pseudo F2L minus 1 slot: B' D L2 D'
All but 5 corners: B2 D' B D + L * B'
Correction: F D B2

Insert at *: L F R' F' L' F R F'
Insert at +: F' R F L2 F' R' F L2

3rd scramble: D2 R2 F2 U F2 D R2 B2 R2 U R2 F' L' D L U' F2 D2 L' B F2
3rd solution: U F U B' D B U2 B2 L' B2 L' B' L B U B' U D' B' D' B U2 B' L' B2 D U' (27 moves)

Spoiler (Click to View)

(Inverse)
Pre-scramble: D' B U F' U'

2x2x2 block: U
2x2x3 block: D' B2 L * D B D
Orient edges: U B U'
More square: B' L' B
More square: L
All but 4 corners: B2 L B
Corner 3-cycle: B U2 B' D' B U2 B' D
Correction: D' B U F' U'

Insert at *: B U2 B' D B U2 B' D'

Another skeletons:

[1] (gives 28 moves)

(Normal)

Pre-scramble: R2 B D' F' D

2x2x2 block: (ready)
More square: L F2 L D
F2L minus 1 slot: L2 F' L2 F'
All but 4 corners: L' D L D L' D' L D2
Correction: R2 B D' F' D

[2] (gives 30 moves)

(Normal)

Pre-scramble: B' D2 R2 B D' F' D

2x2x2 block: (ready)
More square: L F2 L D
F2L minus 1 slot: L2 F' L2 F'
Finish F2L: B
All but 3 corners: D F D L D' L' F'
Correction: B' D2 R2 B D' F' D

[3] (after 1-hour, gives 28 moves)

(Normal)

Pre-scramble: R2 B D' F' D

2x2x2 block: (ready)
More square: L F2 L D
F2L minus 1 slot: L2 F' L2 F'
More square: B D B'
All but 3 corners: D' L B' L' B D'
Correction: R2 B D' F' D