Official Badges (from left to right): The Roaring Twenties: For Numberblocks that are belong in the Twenties The Nine Enders: For Numberblocks whose number ends with 9 Made of Ones: A club for natural Numberblocks, which means all positive integer Numberblocks are in Family of Threes/Three Club: A club for multiple of Threes Rainbow Sevens: A club for multiple of Sevens Prime Club: For prime Numberblocks Odd Blocks Club: For odd Numberblocks Even Tops Club: For even Numberblocks Square With a Hole in Club: For Numberblocks that are differences of two consecutive odd/even squares ((n+2)²-n²), or simply multiple of four (except for 4 himself) Fanmade Badges: - First Row (left to right) The Teens: For Numberblocks that are belong in the Teens (10-19) The Thirties: For Numberblocks that are belong in the Thirties The Old Eighties (name based on 1980s things that are old): For Numberblocks that are belong in the Eighties The Nostalgic Nineties: For Numberblocks that are belong in the Nineties The Seven Enders: For Numberblocks whose number ends with 7 The Eight Enders: For Numberblocks whose number ends with 8 - Second Row (left to right) The Three-Digit One Hundreds: For Numberblocks that are belong in the One Hundreds (100-199) Last Two Digits Club/Ninety-Nine Enders: For Numberblocks whose number ends with 99 (99, 199, 299, etc.) The Star Fives: A club for multiple of Fives Windmill Club: A club for Numberblocks that can make windmill shapes, which means they need to be the sum of a square number and a multiple of four, or simply being a multiple of four or one more than that Semiprime Club: For semiprime Numberblocks, whose are the products of two prime numbers. Square of primes numbers are counted as semiprimes. Sus Club: A club for Numberblocks that can make amogus shapes, they need to be one less than a multiple of four to be in Maximum Bits Club/One Less Than Doubles Club: A club for Numberblocks that are sum of power of twos from 1, or simply one less than a power of two (example: 15=2⁴-1=2³+2²+2¹+2⁰=8+4+2+1)
