Yay more gaming questions!

A recent easter egg was a tribute to these. What are they?

(I think Rogi will hate me for these :D)

Cracked by: Anjul, Bharath, badideabear, bhargava, Rogi, rickde, Sumanth Patlolla, Ananth, Sujoy, Manish Achuth, KK and Vishwas B Sharma