I've never been able to find the 8th red key for the end, and I've never gotten more than 81% secrets.  >:(

I notice one player finished with 30,000 and 100% secrets. There is a room (forgot to note the room number) in the last section before the finish area where you must choose between a back pack or money bags. I always need the back pack to carry the keys, so can't get that money. Hmmm, I just had a thought...  maybe there's a back pack hidden somewhere and that's one of the missing secrets?

Spoiler one, about backpacks:
No, this is the only backpack, and the 30000$ cannot be achieved without it. I thought of this choice as, you can buy yourself an extra Jack if you need one.

Spoiler two, about red keys:

They have Hints. And there is a Hint for the Hints, if I remember well, but you almost need to know the solution to notice it.

Ι have tried to find a path through this room without success. Any help or hint would be really great . I am falling at every attempt /at every colour brick. The mansions are really great fun - but a bit fed up with this one.

BO PEEP

You failed at every colour brick ? :-?

Answer to the puzzle - it's the blue path (the letters of BLUE are in the word NEBULA, and similarly for the other colours). The first blue brick is a bit far away indeed, so jump carefully!

Toybox

Thanks for the clue .After I posted I did find the way through. I had forgotton that re-entering  "reset" the room . I feel like  an idiot now.

Thanks again

Bo Peep

Ah, it happens to me all the time. Forgetting that the room is reset (more with grey door puzzles), and feeling like an idiot  ;)