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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 special episode of Learningblocks. This is the 121st Numberblocks 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.



  • 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 it was an error.
  • The One at the start of this episode is presumably the same One at the end of 100 Ways to Leave the Planet.
  • 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.
  • 2, 7, and 10 stay vertical in this episode.
  • 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.
  • In reality, Seven rolling across the rotating bridge would NOT keep it balanced.
    • Details: On every point where Seven's body touches the bridge, a downward force with the same magnitude is applied. However, since the average distance to the rotational axis on both sides aren't always equal, the torque applied on both sides wouldn't always cancel out, and when they don't, the bridge will start to rotate.


  • 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 word "yelp" fits in with the rhyme scheme of "help" and because Eight can be heard saying a "p" sound.