C4-
PLL
C - 2 2x1s touching
Look for blocks (pairs and lines of matching stickers) on the sides; their kind and position name the group.
Your status
Algorithms (3)
(U2') U2 R2' U2 R2 U R2' U2 R2 U R2' U2' R2 U' R2' U2' R2
My choice
16 HTM · 16 STM · 29 QTM
2-gen
rotationless
<U,R>
Do U2' first (AUF) on the case as drawn. · LowCubes
R2' U2 R2 U R2' U2 R2 U R2' U2' R2 U' R2' U2' R2
15 HTM · 15 STM · 27 QTM
2-gen
rotationless
<U,R>
LowCubes
y2' R2 U2' R2' F2 U' R2 U R2' U F2' U' R2 U2 R2'
14 HTM · 14 STM · 24 QTM
3-gen
rotation
<U,R,F>
LowCubes
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: R2' U2 R2 U R2' U2 R2 U' R2' U2' R2 U' R2' U2' R2. Every algorithm above was run by our logic engine from that state and reaches "pll-solved", keeping first-layers and oll-solved.