I own several of these models and was surprised at how disappointing this one is in comparison. The small traffic jam at the elevator entrance is of no use. It never stops the next one from getting through. Possibly if only 1 was waiting but I use the rest of the marbles that come in the set and they always jump over the small pin and then get stuck under the elevator causing it to jam and requiring the stuck marble to be removed each time. Time. A very sad construction. so many hours with nothing to show.
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