I’d like to see someone make a web RPG that plays in the browser with only JS/Canvas/HTML, maybe Flash would be ok I guess, something that could be played as casually as hitting a web address and made to be played casually for 15-20 minutes on up. One of the things that makes RPGs great is tons and tons of content to make a huge and varied world to explore with lots of story. One of the things that make PC games great is tons of community mods and maps. Why doesn’t combining the two make sense?
