In which Glee episodes does Darren Criss appear?

I'm downloading them all on my iPod. I already have Never Been Kissed, The Sue Sylvester Shuffle, Blame It On The Alcohol, Silly Love Songs, and Original Song. I am definitely getting the one where Blaine tells Kurt he loves him, and I know that's in New York, but I can't remember the names of the other episodes he is in a lot of. (I'm going to buy Born This Way also). So, what are some other episodes Blaine sports in a lot?