Word Tunnel (Free) App
The game can be played against the clock, or in a more slow paced and thoughtful turn-based mode. An untimed mode is also included.
The game offers three dictionaries, selectable via the game's Options dialog:
1. Scrabble: contains all the 2-to-8-letter words from the SOWPODS list of Scrabble competition words. This amounts to 114575 words, including both US and UK spellings. Because this is a Scrabble dictionary, proper nouns like "June" or "Rome" are not included. Plurals are included.
2. Webster's: based on the Webster's New International Dictionary, 2nd Edition, this contains 120130 2-to-9-letter words. Includes some proper nouns, but not plurals or Scrabble-specific words (such as my own favourite, "QI"!).
3. Both! The combination of the Scrabble and Webster's dictionaries; this is the dictionary used by default.
More game modes are coming soon! Please feel free to e-mail me with any bug reports, requests, or questions!