A free app for Android, by Random Logic Games LLC.

Infinite Word Search is a free word search puzzle game that is perfect for all ages. You can search for words across the entire puzzle, or select a category and start searching in that category. Each category has multiple levels of difficulty and multiple game modes. You can select the game mode that you prefer, such as the progression or infinite mode. 

In the progression mode, you will hunt your way through thousands of puzzles, with varying levels of increasing difficulty. If you prefer a more casual experience, you can try out the infinite mode and solve each word search puzzle at your own pace. Infinite Word Search provides you with plenty of ways to solve these word puzzles, so don’t feel like you’re locked into playing it one way only! Find the way that is most comfortable for you.