Hello everyone, I highly recommend this online application called 漢検王 (kankenō), It is an online game that tests one’s Kanji reading proficiency and users are required to provide the correct reading within the (unspecified) time limit for each word.
The app gives the user a choice to select a level that corresponds with one of the levels of the Kanji Kentei （漢字検定）which is an exam that is primarily offered in Japan that tests one’s Kanji proficiency. The levels are 10級 though 1級, with 10級 being the lowest and 1級 being the highest.
Additionally, this app looks like it will see updates in the future and new features will be added since the creator of the site mentions on the Q&A board that he plans to add features such as a continuous trial mode and stats.
Anyways, the link to the website can be found here: 漢検王