A free program for Android, by MicroEra.

If you are looking for an entertaining and brain-teasing game that will help you improve your vocabulary, then this is the right one for you. In this game, you will connect letters in order to form words, and you will have to complete levels. Each level will contain a number of words, and you will have to connect them in order to fill in the blanks. This game will be easy to play if you are a beginner, but it will become more and more challenging as you get better at it.

The gameplay is super simple and fun.

You just need to build words with letters in the ring.