Test Tube

A Chemical Jigsaw Puzzle

Main + Puzzle + Assembly + Balancing + Extra I & II

Extra Pieces With +3 and -3 Valencies

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A  C H E M I C A L  J I G S A W  P U Z Z L E, by Omer Roucoux

© 1978 Omer Roucoux. Page design by Andrew P. Harmsworth
Tuesday 29th of January 2002