How can I delete games I no longer play to free up space on my iPad mini

How to delete [third party] apps on your iPhone, iPad, and iPod touch - https://support.apple.com/HT207618 and tips at: https://discussions.apple.com/thread/8291123

Delete [and restore] built-in Apple apps on your iOS 11 device or Apple Watch - https://support.apple.com/HT208094 - "When you delete a built-in app from your device, you also delete any related user data and configuration files."

How to check the storage on your iPhone, iPad, and iPod touch - https://support.apple.com/HT201656 - "If your device is low on storage, iOS automatically optimizes its available space while installing an app, updating iOS, downloading music, recording videos, and more."

If you need to free up free data storage space on an iPad/iDevice, you need to start by backing up your iPad to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes.

Then delete any installed apps that you no longer use or use infrequently enough that they aren't missed (you can always reinstalled any purchased or free apps at some time later, as you need them).

Thin out/delete any music/videos/movies/TV shows/images/eBooks/eMagazine/iBooks/audio books/Documents/PDFs, etc.

Delete any old saved emails that maybe saved to your iPad.

To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.

Also, you can check to see what stuff is eating up all your valuable data storage space by going into the Settings App,,General Settings Panel, in the right hand column, tap Storage & iCloud usage panel, in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.

Then do a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

Good Luck to You!

With iOS 11 you can also go to settings-general-iPad storage and use the offload feature to free up space but still allow you to re-install later again without data loss if you think you’ll want any of those apps back at some point.

Tap and hold on the icon of the app you want to delete until they start to wiggle.

Then tap on the 'X'.