It's old and probably incredibly difficult to get into if you didn't play these games when they were new, but it's a classic and legitimately free. I believe it was released for free awhile ago, but as far as I know this is the first time on one of these services. This way you can just add it to your library and forget about it for awhile instead of bookmarking it and forgetting about it forever.
link
And while you're there, you might as well grab the other free games on GOG which I'm pretty sure have been posted before.
link
And while you're there, you might as well grab the other free games on GOG which I'm pretty sure have been posted before.