I have set a puzzle over on my Google/Blogspot pages at http://kanjirecog.blogspot.ca/p/kanji-recognition-text-2.html - it is a kanji and kana recognition puzzle for practising reading Japanese at beginning (learn) and intermediate (review) level.
All that is required is to copy the text ( about 9,990 kanji ) which is taken from a Japanese wikipedia page on a well known topic likely mentioned in a Japanese culture class. Copy the text into an editor or word processor and start deleting the kana and the kanji that you already know. Don't cheat ! Just ask the editor to delete the ones that YOU find as you scan the text. THEN try to spot duplicate kanji by eye.
The puzzle gets more difficult as you go down the page. If you are using Heisig or Henshal or Halpern and any standard text to learn kanji, then you should have not problem.
Please let me know if this one is too easy for you to solve at a glance and I will merge 3 or 5 or 17 articles for a smaller 5000 character puzzle.