Sleepy Jack is a 2011 3D flying shoot-em-up video game developed and published by SilverTree Media for Android and iOS on December 14, 2011. Unlike the Cordy games which were freemium, this is the only SilverTree game to be fully paid, costing $2.99 USD on both Google Play and the Apple App Store.
An HD version of the game was also released, in which it is the same game but with improved graphics.
The game (along with the Cordy games) were removed from both Google Play and the Apple App Store on December 8, 2017 due to lack of updates, and also because the company was bought out by GSN Games in March of 2013.
There are only APK downloads for the regular version, not the HD one. If someone has found a download link for the HD version of the game please post it here.