I noticed someone (Yuri) managed to complete the hard version of Companion Bill, turns out he made a great selection of puzzle levels himself.
Puzzling: Back and forth is brilliant, had me stumped for a while DF99-0000-008D-8FCC.
Puzzling: Brick break, great ideas too, a lot easier EE4A-0000-0084-E0AE
Puzzling: Trapped in time, Also good and the easiest to solve yet requires finding hidden blocks 4B90-0000-0090-438D
I'm going to try more later.