I previously showed my Linked Cube set, but then I made only versions with 2-4 continuous lines.
Recently, I decided to add in this set, also I did a full-color puzzle - with 5-7 lines!
My opinion is that the 5-line version is the most difficult. The 7-line version is much simpler, I don’t even know if large cubic can be confused.
The 6-line version is also probably simple, but here you can confuse both large and thin cubic.