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267 of 278 people found the following review helpful
A classic logic puzzle gives a list of clues, from which you much make a deduction. One of the best known is the "Who is the Engineer?" puzzle.

On a train, Smith, Robinson, and Jones are the fireman, brakeman, and the engineer, but NOT respectively. Also aboard the train are three businessmen who have the same names: a Mr. Smith, a Mr. Robinson, and a Mr. Jones.
1. Mr. Robinson Lives in Detroit.
2. The brakeman lives exactly halfway between Chicago and Detroit
3. Mr. Jones earns exactly $20,000 per year.
4. The brakeman's nearest neighbor, one of the passengers, earns exactly three times as much as the brakeman.
5. Smith beats the fireman in billiards.
6. The passenger whose name is the same as the brakeman's lives in Chicago.

Grid Detective would classify this one as Easy. In 30 excellent puzzles, a Gridwork is given with the relevant names, wages, colors, cities, or hobbies, and the cursor can mark X or O on the various squares to make deductions.

A trainer puzzle is given at the start. After that, there are 10 Easy, 10 Moderate, and 10 Hard puzzles.
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76 of 82 people found the following review helpful
TOP 1000 REVIEWERon September 24, 2011
Verified Purchase
Remember the old DELL Logic books? The ones where you wore through the page erasing your marks?

Imagine....

An electronic version, using X and O, and auto populating the rest of the spaces with shading or the appropriate X each time you correctly figure out a clue. If you enjoyed the paper version, you'll LOVE this game.

Easy to navigate on the Kindle. X for "not an option" O for "correct answer", Space bar deletes what you have put into the square. PAGE forward to move to the next clue (which highlights the clue you are working on.)

Great Kindle distraction!

NOTE: update 10/2/11: This game will download to the new ($79) Kindle (many will not... see my review), and the 5 way can be used for the X and O (middle button with either single or double clicks. (12/26/11: but it is not ported to either the Kindle Touch or Kindle Fire).

Enjoy!
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58 of 62 people found the following review helpful
on September 23, 2011
Verified Purchase
I always buy the logic problem puzzles and so when this free game came along I grabbed it. I love it, especially the fact that you csan erase and start over without destroying the paper grid :). If you like logic puzzles you will love this.
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36 of 42 people found the following review helpful
on October 23, 2011
This game started out great. I loved playing these kinds of puzzles when I was a kid. I was loving this, until I waited a couple days to come back to it after finishing about half of the puzzles. My place had been lost, all progress erased, and I had to start all over at the beginning. So I started at the end and worked my way backward instead. The next day yielded the same results. No history of me even having played. I deleted the game, and now my kindle loads faster than when the game was on it. Go figure.
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11 of 11 people found the following review helpful
on October 6, 2011
This is the thinking woman's crack. Couldn't stop. Wanted more.. more.. more! Tried to go cold turkey but found the only way to stop was to finish all the puzzles. I did. Now I am sad.
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10 of 10 people found the following review helpful
on November 20, 2011
Verified Purchase
Alright, Amazon, now I'm hooked and there is only one title available. I bought three of the "Logic Puzzles by the Dozen" series only to discover (not having read the reviews) that they are not Kindle interactive. We need more like this one. Anyone listening?????
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8 of 8 people found the following review helpful
on September 25, 2011
Verified Purchase
I've always loved this type of logic puzzles, but always hated filling out the grids. One misplaced "x" could derail your whole solution. And making revisions always became messy.

This version for the Kindle makes marking and correcting MUCH easier. When you find the correct answer for one of the items, you can just mark it, and the corresponding x's are automatically filled in for you! I have not made my way through all of the puzzles yet, but I look forward to it!
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5 of 5 people found the following review helpful
on November 16, 2011
Verified Purchase
As a fan of logic puzzles I was a bit skeptical that these would meet my expectations. However, they were terrific. I just wish there was more of them. I have already solved all the puzzles and can't wait for more to be available.
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5 of 5 people found the following review helpful
This has been my favorite type of puzzle since I first came across it in GAMES magazine centuries ago in the 4th grade - and hard to find when you consider how addictive it is! You usually have to buy a variety puzzle book or magazine with tons of puzzle types you're not interested in just for the pleasure of 2 or 3 of these. Finding a collection of them here, and free to boot, was a truly delightful and nostalgic surprise.
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7 of 8 people found the following review helpful
on September 24, 2011
Verified Purchase
You probably remember these games from your childhood. I used to suck at them... I hated them. Apparently my deductive and logical skills have improved as I aged and now I love Grid Detective. If you don't possess these skills as well as some patience and tenacity, this game will probably disappoint and frustrate you.

With Grid Detective, you use an introductory paragraph and 6 clues to solve a matrix puzzle. By placing an "X" in squares in a table, you indicate that the two items have no relationship. By placing an "O" in a square, you indicate that the two items have a relationship. An example clue would be "Jenny had orange sherbet in a cone." You would put an "O" in Jenny's column where it intersects with the "Orange Sherbet" option because you now know that she had that kind of ice cream. You would put an "X" in Jenny's column where the item says "In a cup" to indicate that Jenny's ice cream wasn't in a cup but you still don't know if it was a sugar cone, a waffle cone, or wafer cone. When you find out that Lucy had her ice cream in a waffle cone, you've whittled down the options for Jenny to sugar and wafer cones... and so it continues.

There are 31 themed puzzles, if you include the introductory puzzle, in three categories: Easy, Intermediate, and Hard. Using the page forward and page back buttons, you move through and highlight each of your 6 clues. Using the 5-way controller, you click once to add an "X" in a square and click twice to add an "O". When you add an "O" to a cell, the other squares in that row and column (that cannot be O's now) are automatically populated with X's.

The game includes the standard features you're used to at this point: Restart, Undo (Back), Erase Errors, Show Solution, and Hint (three per game). There's also a feature called "Position Guides" which helps to show you all the places on the puzzle grid that are associated with the current position of your cursor. This is sort of a reminder to double check any squares related to the one you're on to see if you can put an X or O in them. The Undo is unlimited so you can reverse as many moves as you need to. There are keyboard shortcuts (i.e. clicking E will Erase Errors rather than you having to go to the menu to do it). While you're playing the game, you can't see the timer, but once you solve the puzzle, you can see the time it took to solve it, the number of hints used, and the number of times errors were found in the puzzle when you used the Erase Errors feature.

Simply put, the instructions need work. With any new game, I always check out the instructions first. Even though I had a general idea of what you needed to do and how to do it, the instructions just confused me more. They tried and the game itself is complicated when you're new to it, but they didn't help me understand the game much more than I did before reading them.

Overall, this is yet another addictive game from Amazon Digital Services.
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