100 doors 2013 level 119, is about moving a knight chess piece but you not allow to moving on the middle of board, check picture below for detail

100 doors 2013 level 119 100 Doors 2013 Level 119 Walkthrough

board is divided into 3×3 array, with number from 1 to 9, chess knight can not be at 5. so this is the sequence of chess knight movement.

from 1 to 8, 3.4, 9, 2, 7, 6, and finally back again to 1

numbers that past through by knight chess is a number that you have to tab on the keypad: 183492761