If you're like me and rarely play anything really graphic intensive then you can get an i5 and pretty much be set.
"Graphic intensity" doesn't correlate with how much CPU is used. Graphics rendering is done solely by the GPU.. unless you're using a piece of stuff software. And I don't mean Blockland; Blockland still renders on the GPU. Realistically there is little to no reason you need anything more than an
i3 for games, because unless the game completely lacks optimization it shouldn't be using a significant portion of your processor's resources.
Alternatively, if you're like me and don't close any programs when you're done with them, get an i7. It'd drive me nuts if I had to close Photoshop every time I wanted to watch a video I opened in my 70th tab from Blockland.
