Developer Zach Gage has a knack for putting together simple, accessible games that you can play for hours on end. He's been involved in a number of high-profile iOS games, but one of his earlier hits was the word game SpellTower [$2.99]. That was one of those games that seemed to transcend the usual crowd that played mobile games, appearing on the devices of the most unlikely of people. And why not" Word games play well with a large audience for a variety of reasons, and SpellTower was a very good one. Gage is back at the genre with TypeShift [Free] , but I can't help but feel this is aimed at a very different sort of player. It's an attractive game with an enjoyable primary mechanic, but there are a few things that keep it from reaching the heights of Gage's previous tower. The core gameplay in TypeShift involves making words from a bunch of letters arranged on dials. So if the puzzle involves four-letter words, you'll have four different dials with a group of letters on them. You slide them up and down with your finger, arranging them to make a word. It's a bit like entering in the combination on a bicycle lock, and although it can be fidgety here and there, it feels good to flick those letters around. Broadly speaking, there are two types of puzzles to be found in TypeShift. The standard puzzles have you trying to use each of the letters on the dial at least once to make words. There are always a few key words that will check them all off, but if you get there by mo...