One great thing you should look out for is the word hike boosters. To be sincere, these boosters are way better than in some games, and to add, they are very helpful. You are given a hint and a certain amount of coins every day. Word Hike Pointer Booster can be used to reveal a single letter of any selected square of your choice. This booster costs 100 coins. 
You have more Boosters to choose from: