Help for the descent
Support
Restore The Full Descent
On the title screen, tap The Full Descent or Challenges, then Restore Purchase. Use the same Apple Account you bought it with.
Learning to play
On the title screen, How to Play explains every move and every enemy, with short practice lessons.
Leaderboards and achievements
These need Game Center. Sign in under Settings → Game Center, then reopen the game. Earlier achievements sync when you sign in.
Your progress
Runs, records and achievements are saved on your device only. They don’t sync between devices, and deleting the app erases them. Your purchase is never lost; restore it as above.