Credits for Slide Tilt Roll

Slide Tilt Roll is © 2016 Eric L Ball, all right reserved

Ball texture “Cream Marble” by Giles Hodges

Background starscapes from the NASA Hubble Space Telescope Image gallery

All other artwork created by Eric Ball using Persistence of Vision Raytracer v3.7

Levels created by users as self attributed

Thanks to the many individuals who have freely provided iOS/Swift programming information on the Internet