Crossgrams

"Crossgrams is a new kind of word puzzle which mixes anagrams with crosswords (and has a pinch of Sudoku). It's simple, challenging, and extremely addictive. To unscramble each puzzle, just drag letters left and right (never up or down), but watch out: it's not as easy as it seems!

Each letter you solve and pin in place is a new clue for the surrounding words. Puzzles range from bite-sized fun to brain-busters you can spend a whole afternoon chipping away at, just like a weekend crossword puzzle."