Here are a few free and popular options:

• Website: https://chessclock.org/
  
• Android app: https://play.google.com/store/apps/details?id=com.chess.clock&hl=en_CA
  
• Apple app: https://apps.apple.com/us/app/chess-clock-by-chess-com/id858039162
  

Don't want to download an app?

If each player has a device with a timer option, they can set their own timer to the same time ie 20 minutes. Confirm each player has the same amount of time set on their timer. The first player will start their timer and place a piece. After placing their piece, they will press pause on their own timer. The next player will then press start on their timer, place a piece, then press pause on their own timer. Keep repeating until the last piece is placed. Compare the time remaining on both timers - the person with the most time on their clock wins! 

How much time should I set on the clock?

The amount of time set can vary based on the goal of your game and/or skill level. It also varies based on the piece count. For Cobble Hill's 100 Piece Puzzle Chess games, here are suggested times:

Super competitive play = 5 minutes
Casual-competitive = 15 minutes
Just hanging out = 30 minutes

If a player runs out of time on their clock they automatically lose. So, if you want to declare a winner by time remaining, set the clock for a little longer than you think you need.

Remember, it's the player with the most time remaining who wins!

• To help kids have a fun first experience with Puzzle Chess, start with more time than you think you’ll need. The goal at first is confidence and excitement, not pressure.
• A great way to estimate a good starting time is to first let your child build the puzzle on their own without the chess clock. Many families find it easiest to begin by building the frame first, then timing how long it takes to complete the inside pieces. Once you know roughly how long that takes, you can use that number as a guide when setting the clock for future games.
• For example:
  If the inside takes about 12 minutes to finish, try setting each player’s clock for 15 to 20 minutes.
  As players improve, shorten the time to make games faster and more competitive.
• You can also adjust the experience by giving younger players extra time (you can set different clock times for each player to help balance skill levels).
• Playing in teams! Try 2 vs 2 by having teammates alternate turns. Adults vs Kids or pair younger and older children - mix it up !

Puzzle Chess is meant to grow with the player. Some families love the fast-paced challenge, while others enjoy a casual gaming experience and friendly competition. Whatever you choose, we hope you have fun with it!