Games with "logical" puzzles - an IFDB Poll

Some puzzles--like chess problems or sudokus--can be difficult even though you know all the rules. I'm looking for IF games with this kind of puzzle: you can get to know the rules by simple exploration, and then you still have to solve the puzzle through logical thinking. A prime example would be the time paradox puzzle of All Things Devours, but please point me to more games. (Lock & Key, on the other hand, would not be a game of this type: the interaction between the traps is highly unpredictable, and a lot of trial and error is needed to solve the game.)

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	All Things Devours, by half sick of shadows 11 votes "You get to..." [+]"You get to understand the nature of the time paradox puzzle early on, but it still takes a good bit of thought and ingenuity to successfully solve it." ( - Full review) --Victor Gijsbers... (No comment) [+](No comment) ( - Full review) --JonathanCR... (No comment) [+](No comment) ( - Full review) --Nusco... (No comment) [+](No comment) () --Dave Chapeskie... (No comment) [+](No comment) () --Cheryl L... (No comment) [+](No comment) () --DJ... (No comment) [+](No comment) () --Sobol... (No comment) [+](No comment) ( - Full review) --lkdc... (No comment) [+](No comment) --DAB... (No comment) [+](No comment) --kieuk... (No comment) [+](No comment) () --Titania Lowe... Vote for this game

	Delightful Wallpaper, by Andrew Plotkin ('Edgar O. Weyrd') 4 votes "The first half..." [+]"The first half has some logical elements." --Victor Gijsbers... (No comment) [+](No comment) () --Nusco... (No comment) [+](No comment) () --Cheryl L... (No comment) [+](No comment) () --Sobol... Vote for this game

	Zork III, by Dave Lebling, Marc Blank 4 votes "Rotating the box" [+]"Rotating the box: I remember getting the alternate solution, then only later really understanding how to move the box--a definite a-ha moment." () --Andrew Schultz... "the royal puzzle" [+]"the royal puzzle" () --Denk... "Puzzles such as..." [+]"Puzzles such as the Royal Maze are easy to understand in concept but then require careful manipulation to reach a solved state." --Emily Short... (No comment) [+](No comment) --Atari Lover... Vote for this game

	Suveh Nux, by David Fisher 4 votes (No comment) [+](No comment) () --four1475... "Once you start..." [+]"Once you start figuring out the spells, you have to logically work out how to put them together to escape." ( - Full review) --tggdan3... (No comment) [+](No comment) () --DJ... (No comment) [+](No comment) () --Sobol... Vote for this game

	Lists and Lists, by Andrew Plotkin 3 votes "This whole game is a programming puzzle" [+]"This whole game is a programming puzzle" () --Wladimir... (No comment) [+](No comment) () --Sobol... (No comment) [+](No comment) () --DAB... Vote for this game

	Zork Zero, by Steve Meretzky 2 votes "The grain,..." [+]"The grain, chicken, fox puzzle is an old logic game. There is also a towers of hanoi game that needs to be solved. " ( - Full review) --tggdan3... "There is a..." [+]"There is a classic knaves and knights puzzle to be solved." --Cryptic Puffin... Vote for this game

	The Dreamhold, by Andrew Plotkin 2 votes "Amazing, beautiful puzzles." [+]"Amazing, beautiful puzzles." --Kitnoki... (No comment) [+](No comment) () --Cheryl L... Vote for this game

	The Art of Fugue, by Victor Gijsbers, Jimmy Maher, Dorte Lassen, and Johan 2 votes "Working on this game inspired me to create this poll in the first place" [+]"Working on this game inspired me to create this poll in the first place" --Victor Gijsbers... (No comment) [+](No comment) () --Sobol... Vote for this game

	Threediopolis, by Andrew Schultz 2 votes "Voting for own game" [+]"Voting for own game: Many easier destinations are pure-logical. For advanced mode/harder, deduction&guesswork are required." --Andrew Schultz... (No comment) [+](No comment) () --Sobol... Vote for this game

	Faithful Companion, by Matt Weiner 2 votes "Like a much smaller "Art of the Fugue," where the problem becomes coordinating characters. (My own game.)" [+]"Like a much smaller "Art of the Fugue," where the problem becomes coordinating characters. (My own game.)" --matt w (Matt Weiner)... (No comment) [+](No comment) () --Sobol... Vote for this game

	Fingertips: Who's Knockin' On The Wall?, by Melvin Rangasamy 2 votes "Ultimate Logic Puzzle Generator" [+]"Ultimate Logic Puzzle Generator: Who's Knockin' generates a different logic puzzle with every game, randomising the structures and clue orders so that each game is unique but always solvable." ( - Full review) --Joey Jones... (No comment) [+](No comment) () --DAB... Vote for this game

	Fifteen Minutes, by Ade McT 2 votes "Very well implemented puzzle, with increasing complexity" [+]"Very well implemented puzzle, with increasing complexity" () --Virix... (No comment) [+](No comment) () --Titania Lowe... Vote for this game

	Junior Arithmancer, by Mike Spivey 2 votes "The entire game is a math and logic puzzler." [+]"The entire game is a math and logic puzzler." --Lance Campbell... (No comment) [+](No comment) () --Titania Lowe... Vote for this game

	Accuse, by David A. Wheeler 2 votes "The whole game is a logic puzzle. Short, but amusing and randomised." [+]"The whole game is a logic puzzle. Short, but amusing and randomised." ( - Full review) --verityvirtue... "Sort out whodunit by simply accusing people of the crime" [+]"Sort out whodunit by simply accusing people of the crime" --NJ... Vote for this game

	Ad Verbum, by Nick Montfort 2 votes "Not sure if it..." [+]"Not sure if it counts, but many areas require you to only use words beginning with certain areas so you must come up with alternate ways of saying "east" with w's or "west" with e's. " ( - Full review) --tggdan3... (No comment) [+](No comment) () --DJ... Vote for this game

	Rematch, by Andrew D. Pontious 1 vote (No comment) [+](No comment) () --Virix... Vote for this game

	Gleaming the Verb, by Kevin Jackson-Mead 1 vote "A very short..." [+]"A very short brain-teaser IF with a single puzzle that requires logical examination of the text in order to complete the game. " ( - Full review) --Sorrel... Vote for this game

	Captain Verdeterre's Plunder, by Ryan Veeder 1 vote (No comment) [+](No comment) () --Sobol... Vote for this game

	Orevore Courier, by Brian Rapp 1 vote (No comment) [+](No comment) () --Pinstripe... Vote for this game

	Byzantine Perspective, by Lea Albaugh 1 vote (No comment) [+](No comment) () --Cheryl L... Vote for this game

	Katana, by Matt Rohde 1 vote "Contains several..." [+]"Contains several old-chestnut logic puzzles, not always perfectly integrated into the setting." --Emily Short... Vote for this game

	Sequitur, by Nigel Jayne (as Tin Foil Jenny) 1 vote "You need to put events in a logical sequence to solve the mystery." [+]"You need to put events in a logical sequence to solve the mystery." --NJ... Vote for this game

	The Grand Quest, by Owen Parish 1 vote "The puzzle with..." [+]"The puzzle with the playing cards." --Victor Gijsbers... Vote for this game

	The Bryant Collection, by Gregory Weir 1 vote "The "Tower of..." [+]"The "Tower of Hanoi" section of this game is a big puzzle of the logical type. Some basic exploration shows you what the pieces do and how they interact; it's then up to you to find the configurations that allow you to solve the puzzle." ( - Full review) --Victor Gijsbers... Vote for this game

	Adventurer's Consumer Guide, by Øyvind Thorsby 1 vote "Highly logical..." [+]"Highly logical puzzles based around unique inventory objects." ( - Full review) --Bernie... Vote for this game

	Sugarlawn, by Mike Spivey 1 vote "One big optimization puzzle. Every step needs to be considered logically." [+]"One big optimization puzzle. Every step needs to be considered logically." --Lance Campbell... Vote for this game

	Got Toast?, by Jim Fisher 1 vote (No comment) [+](No comment) ( - Full review) --Bernie... 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.