DroidQuest, Gate and Logicly are modern logic puzzle games based on the classic educational games Rocky's Boots (1982) and Robot Odyssey (1984). [more inside]
posted by speicus on Nov 2, 2009 - 22 comments

A nearly impossible logic puzzle. Other mindtwisting puzzles. More puzzles of varying difficulty (don't scroll down too far!). XKCD's take. (previously epic post Also: 1, 2)
posted by desjardins on Jul 30, 2009 - 47 comments

Friday Flash Fun*: Конструктор: Engineer of the People, in which you are an engineer working in a top-secret semiconductor facility called H3, designing top-secret integrated circuits based on specifications provided to you. *For certain values of 'fun'
posted by daniel_charms on Mar 27, 2009 - 36 comments

Metafilter's Back Monday Flash Fun: Two Rooms is a logic game where you trigger switches to move barriers out of your way. [more inside]
posted by schyler523 on Jan 26, 2009 - 9 comments

A mindbending logic puzzle. A thousand people on the island, 900 brown-eyed and 100 blue-eyed; anyone who learns their own eye color must kill themself the next day; a visitor mentions that there is a blue-eyed person on the island; what happens? Nothing, you say, because they already know that? Wrong. Further details at the Terry Tao post linked above, but don't scroll down below the boxed description unless you want hints and/or spoilers. [more inside]
posted by languagehat on Feb 15, 2008 - 390 comments

A virtually unlimited supply of randomly-generated logic puzzles, in a variety of sizes and difficulties: Nonograms. Slither Link. Nurikabe. Bridges. Light Up.
posted by Upton O'Good on Nov 28, 2007 - 18 comments

Let’s Do Lunch. (Previously and previously.)
posted by Soup on Nov 22, 2007 - 26 comments

Use everyone's logic and vocabulary skills to figure out what the secret word is.
posted by Blazecock Pileon on Jul 20, 2007 - 27 comments

The Einstein Puzzle by Flowix Games is based on an old DOS game called Sherlock, which, in turn, was based on Einstein's (Supposed) Puzzle (Previously). No, it's not Friday yet, and no, it's not Flash. It's a really logical game, and it's really damn hard. I've only won once, and that was within the first few times of playing. If you find it hard to figure out what's going on, read THIS... It helped me to figure out EXACTLY what the hell was going on. The authors are Russian, and the help in the game may only serve to confuse you. ;) It's free, and runs on Windows, Mac, and Linux. I'm hooked on it, Dammit. :D
posted by Vamier on Mar 22, 2007 - 32 comments

Labor Intensive is a new online puzzle extravaganza in the style of the MIT Mystery Hunt and the aforelinked Puzzle Boat. Appease the Gods by performing twelve puzzly labors. Good luck!
posted by painquale on Sep 22, 2006 - 3 comments

3D Logic Connect the colors on the cube
posted by Bezbozhnik on Jun 2, 2006 - 37 comments

Who has the fish? Einstein logic puzzle. If I can do it, you guys can.
posted by swift on Aug 4, 2005 - 53 comments

"WARNING!!! The puzzles on this site are very difficult, and most require the use of a good spreadsheet program in order to solve them. It will take many hours, perhaps days, to solve each puzzle..."
posted by limitedpie on Aug 11, 2004 - 7 comments

Japanese Flash logic test
Get the family from one side of the river, to the other. [more inside]
posted by plemeljr on Apr 8, 2004 - 28 comments