Also, I got the Kong achievement BEFORE I correctly deduced it was someone disguised as poiror. I got it when I accused poiror himself, got a score of 17/27, and then the achievement popped.
To LU_MUJA (maybe @LU_MUJA ?), there seems a way of locking yourself out of finishing the game. If you do not fiddle with the TV twice, you can do everything else correctly and end up with 11 clues. This means that when you go to talk with Sighret in the final room, you have no way of finishing your deduction, and no way of going back, and the only way is to restart the game. And it is NOT obvious that you need to fiddle with the TV twice, since the secret door in the main room opens after you get the clue from the TV.
May I suggest moving the clue to inside the new trapdoor? That way, the first turn of the TV opens the empty trapdoor, and inspecting the trapdoor gives the final riddle as well as opens the main room secret door?
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