teisjm said:
You could easily argue, that Zelda is a sandbox game, with the big open world, and sidequests.
While those describe sandbox games, those are not the defining characteristic.
It's the ability to just fuck around as a valid, and fun, aspect of gameplay. Zelda doesn't really have rewarding fucking around. You go, you sword some monsters... which you'd be doing anyways.
In a sandbox game, You're grabbing a car, driving up stairs, hitting pedestrians, setting things on fire by ramming into them with a flaming death machine, getting out, stomping a few hookers, and then grabbing an ambulance so you can blare your sirens while running over grannies.... and NONE of it has any point. You're not grinding 'XP' or making money or doing anything but pissing around for the sake of pissing around. And there's no punishment for it above maybe some cops chasing you down until the game either kills you in a spectacular explosion, or gives up cause you outran them or whatever. There's no narrative consequence, no in-game punishment... just going around and playing randomly and with impunity.
It's this emergent 'make your own fun' style game play that differentiates the sandbox from the standard action-adventure.