Flash died at the end of 2020, killing a lot of games, including these ones.

BlueMaxima's FlashPoint archived these: https://bluemaxima.org/flashpoint/

And I have a backup of these as well: https://drive.google.com/drive/folders/17fKWbb-vYFl2qlTISBtTK6-xbgTuJfu3?usp=sharing

Or you could use https://afro-ninja.com/ with a browser that still supports Flash.

To play these, you need a SWF Player. Newgrounds has their own called the "Newgrounds Player' and Adobe had a standalone version which you can still download. Google around, you'll find something.