Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.
Download on the App StoreAudiobus is the app that makes the rest of your setup better.
OT - re-live the 1980s with Missile Command Recharged on mobile
Atari have just launched the (quite excellent) Missile Command Recharged for free on mobile (iOS and Android)
https://www.atari.com/games/missile-command-recharged/
https://apps.apple.com/us/app/missile-command-recharged/id1494023721?ls=1
https://play.google.com/store/apps/details?id=com.atari.mobile.missilecommandmc
Go get it now and post your high scores here! (Screenshot for evidence please 
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