There's an abandoned, dilapidated playground at Commonwealth Crescent. Has some of those old-fashioned concrete slides (maybe even the mosaic tiles) Haven't been there for a while -- last I saw it was overgrown with grass (hasn't been used in over a decade, maybe 2).
Do you want old and functional, or run-down? Sorry, haven't seen the ad in question.
I have been looking for old playgrounds for a few months. Found a few places, but to my dismay, those really old ones, like that metal merry-go-round are nowhere to be found. I figured out that most probably they have rusted (removed as too dangerous for children) and or someone stole them and sell it to metal collectors. :S So I guess it's unlikely to find them anymore, in singapore.
I hope that through this thread I can gather some information on some places which i found online, but do not know the exact location.