Copydogs
I still find the amount Zynga copy game concepts mind-boggling. Related to this, it looks like Zynga employees love the game they shamelessly ripped off:
When Zynga came knocking and wanted to buy up NimbleBits, developers of Tiny Tower (which Apple recently named one of their games of the year), it didn’t take a genius to figure out that if the deal didn’t go through, Zynga would rip-off NimbleBit’s games anyway. And — shocker — it turns out that’s just what happened.
Checkout the beautiful open letter from NimbleBit to Zynga congratulating them.