|This article is about a/an episode in Kamen Rider Kabuto.|
Riddle + Riddle ＝ X (謎＋謎＝Ｘ Nazo Tasu Nazo Wa Ekkusu) is the twenty-third episode of Kamen Rider Kabuto.
Worms begin attacking anyone and everyone that possesses pieces of the meteorite. Arata questions Souji as to how he originally came into ownership of his belt and the truth about the financial state of the Discabil family is exposed.
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- Souji Tendou (天道 総司 Tendō Sōji): Hiro Mizushima (水嶋 ヒロ Mizushima Hiro)
- Arata Kagami (加賀美 新 Kagami Arata): Yuuki Sato (佐藤 祐基 Satō Yūki)
- Hiyori Kusakabe (日下部 ひより Kusakabe Hiyori): Yui Satonaka (里中 唯 Satonaka Yui)
- Yuzuki Misaki (岬 祐月 Misaki Yuzuki): Anna Nagata (永田 杏奈 Nagata Anna)
- Shuichi Tadokoro (田所 修一 Tadokoro Shuichi): Yoshiyuki Yamaguchi (山口 祥行 Yamaguchi Yoshiyuki)
- Masato Mishima (三島 正人 Mishima Masato): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Tsurugi Kamishiro (神代 剣 Kamishiro Tsurugi): Yusuke Yamamoto (山本 裕典 Yamamoto Yūsuke)
- Jiiya (じいや Jiiya): Yasukiyo Umeno (梅野 泰靖 Umeno Yasukiyo)
- Jyuka Tendou (天道 樹花 Tendō Juka): Natsumi Okumura (奥村 夏未 Okumura Natsumi)
- Hiyori of 7 Years Ago: Reina Fujii (藤井 玲奈 Fujii Reina)
- Soichi Kusakabe (日下部 総一 Kusakabe Sōichi): Go Narumi (鳴海 剛 Narumi Gō)
- Satomi Kusakabe (日下部 さとみ Kusakabe Satomi): Kaori Asano (浅野 香織 Asano Kaori)
- Geophilid Worm: Isao Take (竹 勲 Take Isao)
- Fortune Teller: Hasune Uehara (植原蓮音 Uehara Hasune)
- Target: Mick Iriki (ミック入来 Mikku Iriki)
- Customer: Masashi Shoyama (生山 雅士 Shoyama Masashi), Kimiyo Matsumoto (松本 江世 Matsumoto Kimiyo), Kiyoshi Hara (原 精 Hara Kiyoshi)
The group watches and Yamato narrates the variations of Rider Kicks during the course of the years. Yamato mentions about the Rider Double Kick of Kamen Riders 1 and 2, Kamen Rider V3's V3 Kick, Kamen Rider X's X Kick, and Kamen Rider Super-1's ten various kicks. In the end, Kagami stands up and does his own Rider Kick (he even shouts the attack name) and falling into his seat with Yuzuki looking. Tendo asks Yamato, "Who are you?"
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- As part of Super Hero Time, this episode aired alongside Gogo Sentai Boukenger episode 19, Task. 19: The Dazzling Adventurer.
- Kamen Rider Gatack has been added on the opening credits following the debut of the previous episode.
Blu-ray Box 2 comes with 16 episodes.