Cryptic Castle

[NannaJoy]

Thanks bip for key clue. Thought the clue for next step was from pool room. But nothing happens. Perhaps my notes not right? or need a different hint.
Out at last! Only 45 coins. May play again and see if I can find more.

[bip]

The gem colour sequenc

from inside pool, in the ceiling are stones, that change colour by click.