EDIT: I tried a different solution for the 2/3 layered renditions. This guide is not complete and it’s flawed.
I got a 4 and 5-layer Pentahedron and opted to grab 2 and 3-layer versions. Here are some algorithms for the smallest version to help before I move on to the higher-order puzzles.
Step #1: Get White & Yellow Centers
This puzzle is red-white-green clockwise unlike a standard puzzle, so get that on white on the bottom and move on to the top.
If you have two swapped, keep the correctly-placed center on the left. With a triangle pointing at you.
F/ U / F / D’ / F /
Step #2: Finish white Layer
Put the proper white piece above its correct location and do the standard 3x3x2 algorithm. R / U / R / U’ / R. This is an easy, familiar step.
Step #3: Last-Layer: Corners
We’re going to start our last layer with corners first. If you need to swap two of these, put the correctly-placed corner triangle pointing at you and:
R / F / U /
R / F / U / R / F
Step #4: Last-Layer Centers
If you end up with a pair of incorrectly-positioned centers, keep the solved side on your right and perform this lengthy algoritm.
L / R / U / R /
U’ / R / D / R /
U / R / U / R
Need to verify this all. Then I’m moving to the bigger puzzles.