Jack

Jack is a character in Numberstairs.

Appearance
He has ninety thousand grey blocks checkered grey and light grey, seven thousand rainbow blocks with each 1,000 blocks being one colour, one hundred blocks checkered light red and lighter red, and four green blocks.

Facts
His name was originally going to be "Fred". Then Numberblocks459 tried to choose from Jack and Fred and he chose Jack.

When people get something wrong, he says people don't know him.