For me it's RTS.
On the other hand, the NES Turtles game that's often bashed for it's difficulty... well, I don't find that one particularly difficult at all until the Technodrome, and even then it's manageable if you don't rush (which I think is the main reason many find it so difficult, they hurry too much and get overwhelmed).
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454 List as Google Doc: https://docs.google.com/spreadsheets/d/1aW2hXQT1TheElVS7z-F3pP-7nbqdrDqWNTxl6JoJWBY/edit?usp=sharing
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/
Free Pc Games thread: https://gamrconnect.vgchartz.com/thread/248138/free-pc-games/1/