The secret room you're missing is closer to the Entrance room than the secret at
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×2S1W
you've already found, but still, if you were to start from the Entrance you'd have to go through just as many rooms to actually enter either of them if you're taking the shortest route...
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×This really only leaves 1S and 1N as the possible locations, considering you can only leave the Entrance room to the West and those are the only rooms you could reach in as few room transitions as 2S1W that are physically located closer to the Entrance.
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×You've already found a lot of secret stuff to the South of this level, so maybe you should look in the North instead!
I hope this silly hint was absurd enough while still being semi-understandable.
