| Word Families (6 titles) |
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| Working Animals (6 titles) |
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| World Explorers (6 titles) |
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| World Festivals (6 titles) |
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| World of Mythical Beings Set 1 (6 titles) |
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| World of Mythical Beings Set 2 (6 titles) |
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| World Religions (6 titles) |
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| World Safaris (6 titles) |
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| World's Greatest Soccer Players (8 titles) |
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| World War II (6 titles) |
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| World Wonders (6 titles) |
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| Wrestling Biographies Set 1 (6 titles) |
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| Wrestling Biographies Set 2 (6 titles) |
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| Xtreme Aircraft (6 titles) |
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| Xtreme Armed Forces (6 titles) |
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| Xtreme Cars (6 titles) |
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| Xtreme Fishing |
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| Xtreme Horror Lab (6 titles) |
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| Xtreme Insects Set 1 (6 titles) |
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| Xtreme Military Aircraft Set 2 (6 titles) |
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