I dunno if this is updated, but its pretty easy to reliably win level 15... people need to use different strategies... its not about having getting as many spots as possible each turn, its about creating an impassable perimeter around the CPU's position as quickly as possible, and that's rather easy.
Easy solution: Start at a numbered block. Pick a direction and start to follow the path of blocks that are similarly colored in that direction. When you arrive at the column that is 1 removed from the column from the start block in the direction you picked: like: [S][>][E], no matter where in the column it is, so long as you followed a path of colored blocks starting from the direction facing it to get there, the first block you arrive at in that column along that path will be the opposite number. 6<>1 3<>4 5<>2 If you can't reach the column 1 removed in that direction along the path that starts in that direction, pick a different direction.
I finally got CSI in easy mode by making no misclicks in the first 6 clicks under the house getting all the bones. No idea if there were bones inside the house or if I was just lucky, but I think that it either counts misclicks in the first 50 or the first 50 is a typo and its some smaller number
There should be some notification clarifying that getting "Genius" does not mean you got the best result. I got "Genius" on all the levels only after optimizing my already "Genius" result for level 8.