Sonic Frontiers M-016 is a Challenge required to unlock the Kronos Island Explorer Trophy/Achievement. That means you’ll need to explore the Kronos Island area to find this Challenge and figure out how to complete it.
As shown on the following map, you’ll have to venture to the north side of the Kronos Island area to find this Challenge.
The M-016 sign is right in the middle of a zone surrounded by six very tall pillars, which are hard to miss.
Or, if you’ve just completed Challange M-015, you are already close, so head southwest for a short distance.
How To Complete Challenge M-016
Once you’ve found this Challenge sign, you can see a couple of plates on the ground near it, one of them being orange. If you already did the M-004 Challenge, you can follow the same logic here. So, you first have to step on the orange plate to start the puzzle. You should see that some of the plates are now blue.
The trick is to walk over the blue plates without touching the other ones. Once you’ve stepped on a blue plate, its color changes, and you mustn’t return to it.
It seems complicated, but you should eventually succeed, and if you don’t, let me tell you the exact route you must take, starting from the orange plate: up for two squares, left for one square, up for two squares, right for one square, down for one square, right for one square, down for two squares, right for one square, up for one square, right for one square, up for one square, left for one square, and finally up for one square.
If you make a wrong step, don’t worry! You can restart the puzzle as many times as you want by going to the orange plate again.
