Best mechanical/physics puzzles. - an IFDB Poll

I had a lot of fun with the underground trolley puzzle in Axe of Kolt by Larry Horsfield. Any other games that feature cool mechanical devices, Rube Goldberg machines or solutions that rely on using the laws of physics (gravity of course, but maybe also optics/reflection, magnetism,...)?
By no means does this puzzle have to be the centerpiece of the game, it just has to be elaborate and really cool.

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	Frenemies; or, I Won An Andy Phillips Game!, by B F Lindsay 2 votes "One-room game where the central puzzle is constructing a Rube Goldberg-ish device" [+]"One-room game where the central puzzle is constructing a Rube Goldberg-ish device" --Mike Russo... "I am glad I put Bill onto Andy Phillips' games" [+]"I am glad I put Bill onto Andy Phillips' games" --Canalboy... Vote for this game

	A Change in the Weather, by Andrew Plotkin 1 vote "The main puzzle" [+]"The main puzzle" () --Denk... Vote for this game

	Inevitable, by Kathleen M. Fischer as Timothy Lawrence Heinrich 1 vote "One big many-room interlinked physics puzzle with a gripping backstory." [+]"One big many-room interlinked physics puzzle with a gripping backstory." ( - Full review) --Rovarsson... Vote for this game

	Castle Ralf, by Doug Clutter and Steve Vance 1 vote "Almost certainly contains the largest IF puzzle in history." [+]"Almost certainly contains the largest IF puzzle in history.: This 1987 DOS adventure contains a problem involving the procurement of a gold key. It runs across multiple rooms often quite distant from each other. It include a Heath Robinson like machine which is a customised skeet shooter. Objects that need to be manipulated and aligned that often affect the layout of far distant rooms include: A crossbow bolt, a steel ball, a series of grooves in a wall, a bag of sand, a radiator, a remote controlled garage door opener, a fan, a sheaf of paper, a chair, a conveyor belt, a magnet, a hole in the wall, a shelf.......yes I could go on. " ( - Full review) --Canalboy... Vote for this game

	The Axe of Kolt [2014 ADRIFT version], by Larry Horsfield 1 vote "Long sprawling oldschool game. A particularly neat multi-part, multi-room puzzle where you have to get a mining cart over a chasm." [+]"Long sprawling oldschool game. A particularly neat multi-part, multi-room puzzle where you have to get a mining cart over a chasm." ( - Full review) --Rovarsson... Vote for this game

	Hezarin, by Alex Shipp and Steve Tinney 1 vote "A perfect blend of crossword and narrative " [+]"A perfect blend of crossword and narrative : There is a puzzle revolving around a system of levers and a vanishing / reappearing staircase which is a masterpiece of logic and frustration running across many rooms." ( - Full review) --Canalboy... Vote for this game

	Metamorphoses, by Emily Short 1 vote "Puzzles are based on physical properties" [+]"Puzzles are based on physical properties" ( - Full review) --MathBrush... Vote for this game

	Hollywood Hijinx, by Dave Anderson, Liz Cyr-Jones 1 vote "Still a classic" [+]"Still a classic: One great puzzle involving a time delay" () --Nathan... Vote for this game

	The Hitchhiker's Guide to the Galaxy, by Douglas Adams and Steve Meretzky 1 vote "The Babel Fish dispenser, an all-time classic" [+]"The Babel Fish dispenser, an all-time classic" () --Robin Johnson... Vote for this game

	Savoir-Faire, by Emily Short 1 vote "Puzzles are based on physical properties" [+]"Puzzles are based on physical properties" ( - Full review) --MathBrush... Vote for this game

	Philosopher's Quest, by Peter D. Killworth and Jonathan Mestel 1 vote "Tough As Old Boots Puzzlefest " [+]"Tough As Old Boots Puzzlefest : The plank and pivot problem down by the cliffs is a masterpiece of old school pen and paper Mathematics." ( - Full review) --Canalboy... Vote for this game

	Grandma Bethlinda's Variety Box, by Arthur DiBianca 1 vote "The whole game is one big mechanical puzzle" [+]"The whole game is one big mechanical puzzle" () --Karl Ove Hufthammer... Vote for this game

Is there another game that you think should be on this list? Just fill in the title of a game you'd like to vote for.

Poll created on June 23, 2021