A free program for Android, by Pink Pointer.

Crosswords is the classic word game. If you have a minute to kill or just want to keep your brain active, this app will help you stay sharp. The app comes with thousands of puzzles in 6 different languages. It also features a clean design that makes it easy to play on any device. With seven achievements from Google Play Games and an option to solve every letter or word, you can challenge yourself and improve your vocabulary. This game also has its own keyboard with only the required keys to improve your speed while solving the crossword puzzle. You can zoom in or out by pinch-zooming or not with the help of your fingers. You can also check if there is any mistake on the puzzle by tapping on the Error option before solving it.