some more logic mashups that will eat away all of your free time trying to understand the rules:
http://web.mit.edu/puzzle/www/2013/coinheist.com/get_smart/portals/index.html
https://sites.math.washington.edu/~ostroff/puzzles/fano_puzzle.pdf
https://puzzling.stackexchange.com/questions/52899/the-ludicrous-loop-over-a-thousand-cells-of-circular-logic
(once again, fair warning: i have only done the last of these three)