Shin Megami Tensei IV: Apocalypse gives the ability to save at any point that you want to, so you’ll want to make sure you’re doing so on a regular basis. It’s especially helpful to save before a tough boss battle, or during a long dungeon trek.
Saving is incredibly simple to do, just hit the Y button to bring up your smartphone menu when you’re out exploring, or on the world map. Once you’re on the basic menu, navigate over to the far right option titled “system” and open it. This menu is where you’ll be able to select save and log down your adventure.
The system menu will also allow you to load a save game, spend app points to purchase bonuses, or adjust the sound levels, difficulty, and street pass settings.