The rules:
1) It's a killer with either 'sums' are given or the sum is 'odd or even'
2) the cages with a green dot add up to an even total, the cages with an orange dot add up to an odd total
3) It's a toroidal, all 'jigsaw pieces' with the same color belong together. (I suppose it's clear that two white and two yellow jigsaw pieces exist.)
4) everywhere IN the grid two adjacent cells contain consecutive digits (in increasing or decreasing order) there is a short fat line inbetween those cells
5) the numbers outside the grid tell you how many cells/ skyscrapers you can see from that vantage point. A cell/ skyscraper can be seen if it is not blocked by a cell/ skyscraper with a higher number.
Have fun with it...
Richard
