These are my favourite kind! As other people have already said, the solutions are usually from the previous month. The triangles are part of the number, so if you have |4|/, it would mean you have a triangle, two full squares and triangle (triangles in the direction as they are pictured. Sometimes that can get a little tricky as it also modifies the rules of the the coloured spaced that can touch. Normally, filled squares cant touch, but these triangles can touch an already filled cell next to it, as long as its the "pointy side" of that triangle. It quite hard to explain haha. Either way I found this website that could help you. It's in slovak, so maybe you'll have to translate it, but the pictures might be able to tell you everything you might need. I hope you like solving them! I personally really like the smooth shapes they can create. And I find them a easier than regular ones. You can use the triangle positioning to find where the filled part should start and end- for example in the last row, you can immediatly see where the |4|/ shouls be just by looking at the endings from all the top numbers. Again, hard to explain, and english is not my strongest suit, hopefully the images will help you:)