How can i unlock this door?
I ve completed the smoke test and now i have to complete the other 2
How does the sound test work? I cant figure it out with the walkthroughs on the internet.

thx 4 helping

Welcome Roberto

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For the sound test you have to ring the gongs in the same order as the faerie. You should have seen it happen in the past, or you can break open the bottle and release the faerie which will then start ringing the gongs.

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The other test you have left is the light test (I think that's what it is called). This is the test with the water pools. you have primary and secondary colors. What you have to do is use the primary pools to create a secondary color (I used purple) and then put these in the secondary pool. You need two gems of the same color (1 in each secondary pool) and this will complete 1 of the 3 tests. Someone listed the gongs already and you said you have completed the smoke test (which should be the powders), so that will unlock the door. Good luck and happy adventuring.