The Game “Kana Warrior” helped me learn Hiragana and Katakana quick and fun: http://www.kongregate.com/games/tukkun/kana-warrior
Accept all challenges and type fast!
p.s. Others also sugguest this comprehensive video as an appetizer for this game: https://www.youtube.com/watch?v=6p9Il_j0zjc
That's a very well designed game! Although I don't need to play it as I can already read kana as effortlessly as the English alphabet, I still always like trying out any Japanese learning games people suggest. I reckon it's the most fun kana learning game I've tried, and seems like it should be a very effective way to quickly learn to read all the hiragana and katakana. ^^
Pretty cool. I played to stage 10 so far, even though I've been learning Japanese for a while now there's still a few katakana characters that trip me up occasionally so I'll probably check it out again later.
When I was first learning kana I played a demo of a game called Slime Forest Adventure which if I remember right is similar, but you do have to download it. I believe that game has some kanji as well.