I'm in the process of implementing some cryptocoin games.
Do you think this is better suited to karmacoin or dogecoin? Or both?
If there weren't 100 other people also working on games for Doge (and who have a head start) then I would say Doge. But my answer would be Karma.
Get a head start and be the first with a Karma game. Karma is going to be much bigger than it is now in a couple of months.
I've seen a couple of other doge games but nothing like I have in mind

But then - I haven't seen many. Do you know of some popular/successful ones?
I agree that karma has quite a bit of good potential though, see how it goes.
I'm just trying to wrap my head around how I can market these games for karma.
It's so easy with doge, as theres plenty of fun one-liners.
Doge is more closely aligned with fun, whereas karma is more aligned to charity/justice/etc.