Puzzle Lock, number and alphabet, is a cool feature on LG G5 which enables you to stop an alarm by solving a puzzle. Puzzles like sorting numbers. To set a Puzzle Lock to stop alarm on LG G5, do as follows:
1. Open the Clock application on your LG G5
2. On the Alarm tab, hit the Add button to create a new alarm
3. Do the changes and set the time, and before saving the alarm, make sure to toggle on the Puzzle Lock option at the very bottom of the screen.
4. Now, you have to solve a simple puzzle to stop the alarm.
Note that, you can also specify the type of puzzle you want to solve. To do this, on the Alarm tab, hit the 3-dot button followed by the Settings and then open the Puzzle Lock option. Available puzzles are: Number Grid and Alphabet Grid.