Harvest of Words is free for all, thanks to the ads managed by our partners. We try to find a balance between making the game fun and still making it free.
If you want to get rid of ads (banners and screens that appear between levels) and want to support the game, you can buy our "Stop Ad" option for a small fee in the Store. You will also see a "special Stop Ad" appearing from time to time which includes 600 coins in addition. Thank you for your understanding and support!