A:AnswerYes you can delete the island and start new it should be on the home screen you press x and go to the data of the game and delete the save data file of the game and you can start a all new island
A:AnswerIf you buy the game on the eshop on the switch with the main profile that the switch is set to then all other profiles on the same switch can all have their own island's but only one switch can be put as the main device to that one profile so the other switch would have to buy the game again from the eshop for a different profile on that other switch
A:AnswerYou can play with up to 4 players at once. It's kind of a strange system as you need to 'switch leader' but it makes sense after a bit of playing and is a nice addition to the game.
A:AnswerThey can play with one copy, if they all want to play at the same time however they would only be able to do that on one console, if they played online they would each need a copy to play together that way.
A:Answer1. Yes, but locally you have to be on the same switch.
2. Sort of? if they have a Dream Address you can visit their island that way if they’re offline, otherwise they have to be online to invite you to their island.
A:AnswerUnfortunately this is only a 1-player game. It can only be a Multi play game if you have another friend that has a switch and the game. You will then be able to play together on the same network or online if you're not connected to the same WIFI.