Yes, that's not an intended solve path. Actually it's quite impressive that you managed to solve this without the intended break-in. Take a look at the first hint in this level. You may need it for more difficult puzzles on this topology.
There's a pure-topology SET thing: including double counting, the weirdo regions are 6 sets of the digits 1-5. The layers are 5 sets of the digits 1-5. The difference between these is the double counting column, which must be one set of the digits 1-5.
Yes, that's not an intended solve path. Actually it's quite impressive that you managed to solve this without the intended break-in.
Take a look at the first hint in this level. You may need it for more difficult puzzles on this topology.
There's a pure-topology SET thing: including double counting, the weirdo regions are 6 sets of the digits 1-5. The layers are 5 sets of the digits 1-5. The difference between these is the double counting column, which must be one set of the digits 1-5.
Ah this must be the intended thing. I will use this next time I encounter this grid!
Oh, damn! That's a great spot and a very curious topology construction.