Nine Hundred (or 900) is an upcoming character in Numberblocks. He is a 30 by 30 Square and a Super Rectangle. He only appeared in One Thousand and One, just like Two Hundred and Three Hundred. He appeared in One, Ten, and One Hundred's thought, when One was thinking of Numbers bigger than One Hundred. He also resembles a giant Nine. He is voiced by David Holt.
- Despite being a square, he has the eyes of a Super Rectangle.
Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen, Twenty, Twenty-One, Twenty-Two, Twenty-Five, Thirty, Forty, Fifty, Sixty, Seventy, Eighty, Ninety, One Hundred, One Thousand, Ten Thousand, One Hundred Thousand, One Million
Big Bad Square, The Terrible Twos, Octoblock, The Three Threes, Octonaughty, Step Squad, The Four Fours
Twenty-Three, Twenty-Four, Thirty-Five, Thirty-Six, Forty-Two, Forty-Nine, Sixty-Four, Ninety-Nine, Two Hundred, Three Hundred
Flapjack Snaffler, Blockzilla, Big Tum
Fluffies, Squarey, Numberblobs, Aliens, Rainbows, Flatlanders, Alphablocks