I've been trying to play the flash games (In particular, Spectrail and Tubular Tiles) but neither of them seem to be loading. Tubular Tiles loads a blank page with nothing on it, and Spectrail prompts me to install adobe flash...which...I have. I went and checked to make sure adobe flash was turned on, and it's on "ask to activate," and for extra measure, loaded another page that had a flash game, and it loaded fine.
Games are my primary source of income since I can't be bothered to do retail, so this really hinders my ability to enjoy subeta. Not to mention, I sometimes log on JUST to play tubular tiles because I enjoy it that much...
For the reference, I am using Mozilla Firefox on a Windows 7 32-bit computer.
Just wanted to add my plus one to this topic, as I am having the same problem with Spectrail. I'm using Chrome
Same trouble here with Spectrail on Chrome 70.0.3538.110 (Official Build) (64-bit) - which has flash player pre-installed.
I clicked "get Flash player" and get a prompt saying that subeta wants to run flash, allowing that just gives me a blank box where the game should be. If I right click on that blank box, I get the message "movie not loaded".
Tubular tiles is also a blank box

The spectrail issue has been happening for a while, at least for some people. There's a thread about it from September. It worked for me up until a couple of weeks ago and then I started getting the black screen too. :( Haven't tried Tubular Tiles.

Well, I'm glad that at least I'm not the only person with this issue. And judging by what others say, it's not just due to browsers, either.
Still makes me very sad that tubular tiles is broken :(