An extension for an extension! Plays the audio when you get a KaniWani review item right, to help reinforce the connection between the thing you just typed in and actual sounds.
No settings, no frills. As with any userscript, you will need to be using Tampermonkey on Chrome or Safari, or Greasemonkey on Firefox. Then just install the script from https://github.com/stephend/kaniwani-audio/raw/master/kaniwani_audio.user.js.
Some ad-blocking or other extensions may conflict with this, e.g. Privacy Badger and Disable HTML5 Autoplay, so if you have issues, try disabling those extensions for *.kaniwani.com.
TODO (if anyone is interested): interface to mute/unmute/stop playback/replay