"Unidentified Developer" messages on Macs

[Aidan]

For anyone getting an app "can’t be opened because it is from an unidentified developer" when you try to start one of our games, do the following:

• Right click, or hold down the control key and click, on the app
• In the menu that appears, select "Open"
• Select "Open" again in the dialog box that appears.

This only has to be done the first time you open the app.

See here for more details and a way to turn this off if you wish.