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Areas of this article contain spoilers about The Treasure of Hexagon Island. Please proceed with caution.

Read at your own risk.

The Treasure of Hexagon Island is the first of twelve special episodes of Numberblocks. This is the 121st episode overall.


Get ready for a special pirate adventure as the Numberblocks set sail in search of treasure. They have to solve Captain Hexbeard's riddles to find it.



  • In the subtitles, in the line "You lend us a hand, now it's your turn to take ours", the word "turn" is missing.
    • Additionally, during the segment where Five helps Three, the subtitles misinterpret the word "yelp" as "yell". This is most likely a mistake as the world "yelp" fits in with the rhyme scheme of "help" and because Eight can be heard saying a "p" sound.


  • This episode's description used to show that it's a crossover with Alphablocks, but it was later removed.
    • This tweet from the Numberblocks Twitter confirms that the crossover idea was either scrapped or was a mistake.
  • This episode was put on iPlayer on Friday, a day before it is aired on TV.
  • This is the fourth episode with a unique credits scene. The first three were The Wrong Number, One Thousand and One, and 100 Ways to Leave the Planet.
  • Twenty-One is the only Numberblock in the episode to not be a number from 1-10.
  • Eight only appears as a cube in this episode.
    • This marks the first time where a Numberblock smaller than Twenty-Seven only appears as a 3D shape (with all coordinates being bigger than 1) in an episode.
  • On the YouTube upload of the special, meant for people overseas who want to watch it, the thumbnail unintentionally spoils Captain Hexbeard's true identity being Twenty-One.
  • Despite being a special, people still consider it as the 121st episode of the show.