You play karuta like normal, but on the cards are IPA vowels. So the guy says /i::::::/ or whatever and you have to pick up that vowel.
<ruby><rb>じゅういっちゃん</rb><rp>(</rp><rt>Juuitchan</rt><rp>)</rp></ruby> Well, I guess what you say is true, I could never be the right kind of girl for you, I could never be your woman - White Town