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Doublets

Invented by Lewis Carroll, the game of Doublets became wildly popular when it first appeared in London's Vanity Fair magazine in 1879. Also known as Word Ladders, this logic game will challenge both your English vocabulary and your powers of reasoning.
Category Price Seller Device
Games $0.99 D. Johnston iPhone, iPad, iPod

The object of the game is to transform one English word into another by changing a single letter at a time. Each change must produce another English word. See the screenshots for an example.

The app contains over 100 puzzles, with more to come. And you can easily add puzzles that you create yourself.

All words used by the puzzles are included in the official SOWPODS Scrabble dictionary.

Reviews

A thinking game
drw2

This game challenges you to visualize words and plan ahead. The undo function is clunky, and there have not been any updates to the puzzle list in a long time, but what's there can keep a person occupied for quite a while. It does not have the graphics of, say, Tiny Wings -- it's definitely a thinking game rather than a doing game. But one should have both, right?