it's a game for 2 players and 2 players only, because you need 2 devices. One player needs to play as guider and the other as explorer.
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You just need to have one device as explorer and one as guider. It's not really a multiplayer game, but you just have to play with 2 persons. Idk if you have 2 pc's, but if you have then you can play it with that or you can find someone to play with. It is a lot more fun if you play it with 2 people tho