If you're like many, I assume, you may have a reasonable grasp on hiragana, but katakana remains something of a challenge. I've just stumbled upon the kana game at BaBaDum (https://babadum.com/). It's indicated by a hiragana character in the game type selector menu at the top of the screen, but from my playing it just now, it seemed like it was approaching 90% katakana. Seems like a fun way to get it down at last! And then you can play the fun, cute vocab games :)