
That's in single level on ludicrous (doesn't do anything there) while practicing rapidly squishing 18 monsters. On ludicrous you can get extra lives in single level, but when you go back they're gone.
Anyway, I think most of you already did this sometime, but I have a screenshot.
Will the "single leve" selection be enabled if the game is beaten on easy?
No idea. When the new version was released I played trough it on hard, and then noticed I got single level.
I think the Single Level option will only become available when you beat the game on Normal mode...
I beat the Normal mode and got the Single Level option
um... single level? man it would be great if i knew what you guys were talking about
In the current version you can select Custom Levels -> Load Level -> x, where x is one of the original story levels.
If you're interested in the screenshot: occasionally I remove old stuff from my small space (and I mean as in storage) on the web. I think it has been long gone from my local storage too.