Hmmm... I got 16 (5, 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 26, 27).
3 is driving me nuts, because I am fairly certain I know it. I am sure I know 4 and 13 as well. The rest I have probably never heard before in my life!
I do know what #25 is, but not how they want you to enter the game name?
Counting that one, I got 17 out of 27. There are some Konami ones which I recognize as Konami, but not which exact game.