Uhh don't you just double tap to get a hint? It makes a sillouhette(spelled wrong) of the right piece and place.
LWBS you have some of the best contests...as an added bonus, your games are great too! Zentomino has a permanent spot on my iPhone
I was very off in the end, had the plus block at the top then started with other pieces... never came close again TanZen and Tangram Pro was great but this I've never actually play before and its hard.