AFAIK, you need to jailbreak to access them Nice to see stuff like this in there! I'd assume it wouldn't pass the review process! Reminds me of... Capcom had an app that was a "virtual arcade machine" where you get to play x games per time period. Pay some chump change to add "quarters" to play more times without waiting. You could pay a higher price to outright buy the virtual arcade machine and play it to your heart's delight, as if you owned it. Games included Street Fighter 2.
Somehow I never picked that one up. Does it run on 16:9 screens / iOS 9? iDOS2 just got updated, but it's not hidden... SDBALL is still in the app store, though I haven't been able to change the ROM file in the recent versions.