Ask HN: know any good browsergames?

I know it is not the best question to ask in a community obsessed about productivity ;-) But still, do you have any recommendations? I very interested to study what makes them successful.

Also, which ones are hacker friendly? Most seem to disallow scripting, for example, which only indicates that they are boring (because they make people do things that a script could do easily as well). Any games that are interesting enough to not warrant scripting? Hacker friendly would be either interesting enough in itself, or allowing scripts (make it a battle of the scripts, maybe?).

The market seems to be booming, but I have not been able to find a browsergame that really appeals to me yet.

Also, shouldn't it be "browser games"? I have found the use "browsergames" more often, though.