What's the scariest flash player game you guys have ever played?

There was this strange game that I found while browsing around the internet when I was a kid. It was a strange japanese website with a cute anime cat girl on the front page and a lot of japanese, pink words I couldn't understand. First I thought it was just a simple GirlGoGames website but japanese version however when I clicked on the anime cat girl accidentally, I was transported to a strange web page with an oddly-looking woman staring blankly at me, below her there were some tiny white dots which were clickable. I never had the courage to click any of them but I do remember a creepy background noise.

What is the scariest flash player game you ever played?