Read the listing
Check the developer, device compatibility and support information in the official App Store listing. Availability may depend on device and region.
Finish initial setup
Complete any required downloads and sign-in while connected. Confirm the particular mode you intend to use later.
Reopen without connectivity
Test launch, play and progress storage with internet access disabled. If it works once, repeat after closing and reopening the app.
Keep useful notes
Record the device, system version, game version and test date. Recheck after an update rather than assuming the earlier result still applies.