For the best experience possible.
The Splatoon 3 Splatfest “World Premiere” starts later this week, and it seems Nintendo has issued some additional advice via its Japanese social media channels. When you first boot it up, be sure to pick the correct region.
Once you’ve selected a region, you won’t be able to undo it in the demo. If you select a region that’s not your own, you may have to deal with different playtimes that aren’t really suitable based on your own location.
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Web Source: Nintendo Life | Latest Updates