This answer will be updated as the series develops
One of the major factors that will heavily affect your solving experience is that it is difficult to visualise the moving parts. For your convenience I've made a tool that can create, visualise and simulate Square Spin puzzles. You can download it on GitHub
Now the question is "how should you solve them?". ...
So as I disobyed the very first rule, this time i worked with 2x2 square blocks instead of 1x2 or 2x1 blocks as per specified rules by the OP. As for any other rule violations, i'm sorry if I did, but here is my solution:
I tried this puzzle for the first time, so I hope I followed the previous rules OP has posted. I went for ...
Note: This answer is here for potential future solvers. Due to the high elegance of this solution I thought it would be ideal to post it as an alternative to @Dark-Thunder's solution. You can see many similarities between these answers, the general movement is the same! All other potential valid solutions should be caught under these ...
A) If the board were instead very large (many billions of cells, for example), what limit could we place on the maximum sign density?
B) Again on a very large board, what limit could we place on the sign density if we eliminate the 4th rule and allow older signs to be blocked?
C) Solutions for odd-size boards, with and without rule 4
As far as I've tried, this appears unsolvable
The process I used to come to this:
I'm going to continue to attempt this, as I feel like I may have made a mistake somewhere in my logic. Assistance would be appreciated.
You need the
Crosswords (Omega Krypton did a lot of these independently of me and probably earlier; I haven't looked at their answers) lead to these letters:
Statue View solution:
Brief explanation (i.e., transcription of my notes while solving the Statue View):
Maze solution by "flood-fill":