for the ones by megalol u can use a python http server but obviously u have to install python first in your mac (usually it's already installed). U then navigate to the folder where the game files are, open the terminal there and run a python http server. After which you can go to your browser, copy the link generated by the http server usually it's
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:: something, open the game folder and the game is running. For games that require adobe flash player you need to download the player for it I forgot how but it is possible is just that Adobe deprecated the tool just find tools to run .swf file.