Wordbase is an online competitive strategic crossword puzzle game that is free to play and has in app purchases.
Pro Strategic word based gameplay
Wordbase plays more like a game of chess than a conventional word game. With each player having a base at each end of the board, the goal is to get to the other side first with words on the board. Thought the most interesting part is that players can cut off the others line of words by intersecting them which results in cutting off the players progress above the intersection.