Ah, it's letting me now! I think it's because I am new here (hello everyone btw!) https://www.signlanguageforum.com/asl/fingerspelling/fingerspelling-game/
Sorry, I don't seem to be allowed to post a link to it but if you Google for "ASL fingerspelling challenge" then it should be the top result (not the ads).
Hey. I've been learning ASL for a short while too and have found fingerspelling tricky I found a great online app a few days ago that has actually helped me quite a lot already.