Technique

1. Found '+'.
2. Top-middle 2 same color.
3. Match bottom color.
4. Down(R), Left(B), Up(R), Right(B).
5. Turn to become base.
6. Check top 4-side(not same color with center).
7. Get color and put opposite side.
8. Up, Right, Down (Right) - Up Left Down (Left).
9. Get back to the base.
10. Match colors for 2 rows.
11. All shapes : Down(R), Right(T), Left(F), Left(T), Right(F), Up(R).
12. Top got '+' but maybe not actual one.
    
13. Turn around top row to match walls.
14. At least 2 walls, 1 at right, 1 at behind.
15. Up(R), Left(T), Down(R), Left(T), Up(R), Left(T), Left(T), Down(R), Left(T).
16. Left(T), Up(R), Right(T), Up(L), Left(T), Down(R), Right(T), Down(L).
17. Top get actual '+', all walls formed.
18. Down(R), Left(B), Up(R), Right(B).
19. To be continued.. (If remember >_<)