I have played the ones on this site Neutral - ブラウザで遊べるゲーム&ツール and thought they were great… they’ve inspired me to dig out the one ‘myst’ incarnation I own - ‘Uru’… which was not a well received game (but I was that desperate to play more of this type of game)
But I can’t play Uru at work… does anyone know of any more of these room-escape myst type clever puzzle games on the internet?