Solitaire will automatically appear on your Apple Watch home screen if you have the Mobilityware Solitaire app on your iPhone™.
If you are having trouble, open the Apple Watch app on your iPhone™ and ensure your Apple Watch and iPhone™ are paired. Download the latest version of Solitaire to your iPhone™ running iOS 8.2 or later. Your Apple Watch should now have Solitaire installed. If you don’t see the app on your watch, launch the Apple Watch app on your iPhone™ and toggle Solitaire to ON.