MacOS - How to prevent process "gamed" from running

On El Capitan MacOS:
launchctl unload -w /System/Library/LaunchAgents/com.apple.gamed.plist

This undoes it:
launchctl load -w /System/Library/LaunchAgents/com.apple.gamed.plist


Before El Capital versions:
sudo defaults write /System/Library/LaunchAgents/com.apple.gamed Disabled -bool true

To undo/reverse the change:
sudo defaults delete /System/Library/LaunchAgents/com.apple.gamed Disabled