Crawler is a word game. Each level contains anagrams that must be unscrambled within a given amount of time to move to the next level. Player gets points for as many words spelled correctly, but can only move to next level by correctly solving anagram. As time diminishes, the letters start wiggling and eventually break apart making it more difficult to use the remaining pieces to solve correctly. Points can be used to fuse letters back together, but doesn't last long. Also the crawling pieces can start eating away at already formed words, reducing your score. Or something like that :)