A wicked kind of a Splatoon hacker has been spotted by a number of players and those of you who have had the worst of it have reported that their save files were destroyed.
Sadly, the who ordeal is new which is why no official steps have been taken so far. However, there are a number of things you should keep in mind if you are playing the game.
While no one has been able to confirm the players’ names; the general reports suggest that the names of these hackers starts with the letter K and has numbers in it. More prominently, the Splatoon hacker has been seen carryiong the unreleased Hydra Splatling with an Octoling.
There can be more than one hackers.
So the first thing you need to do, if you find them in a room is to continue playing until they leave. This is because if you leave first it triggers the plaza to load them and end up destroying your save files. Or else, you could leave and immediately join Turf War.
However, it would be wise to create a backup of your save files on a USB. Check out this link to figure out how you can create backups.
If you spot this Splatoon hacker it would be a great help if you note down the name and report.