I played games on Ubuntu. Sudoku and Mines are included this OS at the beginning and I enjoyed them. I cleared easy, medium, hard and very hard mode on Sudoku, then I finished playing it and started to play Mines. I spent some hours, but I felt hollow. So I ended doing them and began to read some articles. Reading one, I found a English learning website. We can be tested how many words we have and use every course to learn free in twenty-four hours. I challenged. The test said that I know 12,374 words of the 20,000 most frequent words. I wanna get the honor who knows all the 20,000 words.