Copied from something I’m writing.
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Wanikani Self-Study Quiz: Have you ever wished to review a certain type of items or from a specific level? This is it. This script allows you do an extra and personalized reviewing of any items you’ve already learned on WK. Do not worry, as this script will not influence the SRS level of items.
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WaniKani Open Framework Additional Filters: This script serves as an upgrade to the Self-Study one I mentioned above. Basically, it will add filters such as “most recent items learned” and “leeches” (most difficult items for you) to your Self-Study script. For the distance of just a couple clicks, you can get all the extra reinforcement on the items you need the most
Pretty much. The creator has been away from the forums for 8 months. Sometimes the server goes down.