Twenty-One and On is an episode of Season 6 of Numberblocks.
Twenty and chums find out what happens if you go past bus stop 20.
This episode has confirmed that contrary to popular belief, Numberblocks will, in fact, EXCEED Twenty.
This also confirmed that while Twenty-One's design isn't official, the compound Numberblocks DO exist
When the episode was uploaded onto YouTube by "Autism Belton", "Arifmetix" and a few other people, many fans began to spam comments relating to a very popular Numberblocks Youtuber, J W, who uses a blue One (formerly J) as his avatar. This is because the episode had one scene where Twenty-Two splits into a red and blue pair of Elevens, who split into 11 blue and 11 red ones. The blue ones bare a striking resemblance to J W's character, which is the reason behind the overflow.