Restarting Zoo Tycoon DS: New Game vs. Delete Save File
There is no "Restart Game" button in Zoo Tycoon DS. You have two options:
Option 1: Start a New Game (Recommended)
From the main menu, select New Game.
Choose a save slot (3 available).
Your old save remains intact in its slot—you can return to it later.
Option 2: Delete the Save File (Permanent)
On the DS main menu (before launching the game), tap the wrench icon (Settings).
Go to Data Management ▸ Nintendo DS.
Find Zoo Tycoon DS in the list.
Select Erase / Delete.
Confirm. This cannot be undone.
Note
Deleting via System Settings wipes all data for that game (including settings/unlocks). Starting a new save slot is safer unless you're certain you want a clean slate.