Chaos Millenium Builder is a construction toy set designed to build elaborate, Rube Goldberg-style machines. It's essentially a large-scale marble run system with plastic pieces, an AC powered motor, and an adapter. (The motor and adapter are present along with many but not all of the 600+ original pieces.) The goal is to create complex contraptions where a ball rolls down a series of paths, triggering actions and movements in a chain reaction. There were originally about 600 pieces in this set.

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Construction toy set (Village of Rhinebeck)