How to solve the Double Cube V1 (Siamese Cube)

The Double cube can be slightly confusing at first as you are restricted in what moves you can make, F moves, B moves and D moves simply are not possible on either cube. You first need to figure out which piece has been removed and then solve the right cross with the remaining 3 edges of that colour, you might have to do some elaborate moves to get the cross edges in place as normal moves are not available. 2 F2L pairs need to be solved with Pseudoslotting before using unusual inserts such as r U R' U' M as normal inserts are not possible. For OLL, you need to use techniques such as M' U M' U M' U M' U2 M' U M' U M' U M' to flip edges as well as sunes as most other OLLs are not possible, you will then always get an EPLL case so no new algorithms are required there.