Level 4: Medium

• Baby Animals [M-7] (Elin Melchior)
• St. Patrick's Day [M-8] (Vera Mello)
• Grammar & Punctuation Words [M-8] (Timothy Morrill)
• Christmas [M-8] (John Erskin)
• Idioms and Proverbs for Halloween [M-8] (Donna Tatsuki)
• Opposite - Adjectives [M-8] (Vera Mello)
• Valentine's Day [M-9] (John Erskin)
• The Planets [M-9] (Charles Kelly)
• Color Expressions [M- 9] (Vera Mello)
• British to American English #2 [M-9] (Charles Kelly)
• Adjectives [M-10] (Vera Mello)
• Christmas Dinner [M-10] (Donna Tatsuki)
• Medical Terms [M-10] (Vera Mello)
• Currency [M-10] (Vera Mello)
• Animal Sounds [M-10] (Vera Mello)
• Seashore [M-11] (James Milne)
• British to American English #1 [M-12] (Charles Kelly)
• Money [M-12] (Vera Mello)
• Animal Similes [M-15] (Charles Kelly)
• More crossword puzzles can be found on Charles Kelly's website.
  • Crossword Puzzles for Studying English Vocabulary
    There are a couple of hundred Java crossword puzzles here.

Level 6: Difficult

• English Words from Other Languages [D-20] (Seah Hui Yong)
• Metals [D-8] (Charles Kelly)
• Phrases with 'Make' [D-8] (Donna Tatsuki)
• Verbs [D-9] (John Erskin)
• Body Parts Used as Verbs [D-9] (Vera Mello)
• Expressions with Body Parts [D-10] (Vera Mello)
• Physics [D-10] For students studying physics. (Vera Mello)
• Sounds [D-10] (Roger Scupham)
• Valentine's Day [D-12] (Donna Tatsuki)
• Web Vocabulary [D-17] (John de Szendeffy)