For this week’s edition of iPhone Gems we look at a series of brain teaser apps ranging simple trivia and quiz apps to iPhone games based on the popular Jeopardy and Wheel of Fortune Game shows. Brain Challenge 2: Think Again A sequel to last year’s Brain Challenge for iPhone and iPod touch (iLounge rating: B+), Brain Challenge 2: Think Again ($5) builds on the games, puzzles and design of its predecessor, additional additional puzzles…
