Unlocking City in "2 Pets" (PS2): No City Exists

There is no city to unlock in 2 Pets (PS2). The game is a virtual pet simulator focused on raising two animals (feeding, cleaning, playing). No open world, city, or unlockable areas exist.

You may be thinking of The Sims 2: Pets (has neighborhood) or Animal Crossing. Clarify the exact title for accurate help.