T3b-
Notation
Nautilus 1LLL
LL Trapezoids / T3
Match the case drawing, including the side colours and the pieces already solved; hold the puzzle as drawn.
Your status
Algorithms (1)
(R') first, then:
R Lw B L B' Lw R Lw' L' F' Lw R' Lw' F Lw'
My choice
15 HTM · 15 STM · 15 QTM
rotationless
<R,F,L,B>
Do R' first on the case as drawn. · Cubemuch
How this case is verified
The source's case image defines this case; its setup is reconstructed and checked against that independent pattern. Setup: Lw F' Lw R Lw' F L Lw R' Lw' B L' B' Lw' R' R. Every algorithm above was run by our logic engine from that state and reaches "solved-up-to-r".