I almost teared up when I saw this on Epic Win. If there's a childhood toy I wish I still had, this is it:
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I remember spending hours playing with these. I even had the expansion pack. I would definitely play with this set even today, if I still had it. I poked around Ebay and found a set which included the expansion pack, but it ended up going for $220! Um, I think that's too rich for me, even to relive a childhood memory. *sigh*