Those very complicated Rube Goldberg-like ones with knives, toasters, anvils etc. Or did you ever wonder how it would feel to construct a mouse-powered device to cook some eggs and launch a rocket. Do you remember watching with amazement when those cartoon heroes constructed machines to catch someone or start something. Build monkey or mouse-powered machines, use lasers and fire fireworks, start fires using a bowling ball and flint, throw things with anti gravity pla. Well, the answer is here.
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(4.16$) The Incredible Machine Mega Pack GOG CD Key