From the earlier post. . . .
150,000 heroes...nowhere to go
Game Unplugged...Please help
Could your game be next?
These look the most interesting and direct, perhaps. Of these three, I feel that the first is probably the strongest, as it gives a number and an implication that we're not looking to just stop and play other games. "150,000 heroes. Nowhere to go." might be a better phrasing with more punch to it. The "Game Unplugged" lingo (while I LOVE it, personally!) might get us in hot water with the makers of Wreck-It Ralph, given that's a major plot point of that film (unplugging arcade games leaves the characters in them stranded in a surge protector environment forever gameless). The final of the three is thought-provoking and can encourage a random click, perhaps, but it would need a little more to it to get folks to go for it.
Actually, come to think of it, combining option 1 and 3 of these might work well.
Banner image 1 in sequence: 150,000 Heroes. Nowhere to go.
Banner image 2 in sequence: Could your game be next?
If a third is possible. . .: Save City of Heroes. #SaveCOH
Thinking maybe a simple red, white, and blue striped banner background (three lines, horizontal), reminiscent of Statesman's color scheme, though without using his distinctive red-blue-red setup.