Prelogate
dholland 16 Nov, 2015 @ 5:02am
Hints without spoilers for X 7
This puzzle is particularly difficult because it features floating platforms and walls. Also, most of the logic processing for space reasons will have to take place on the 2 large platforms near the inputs, and walls prevent any direct connection between them. This naturally divides the puzzle into two. Extra difficulty comes from the fact that there are always inputs on both sides so that it's not clear how to path to receivers or what logic processing to do. View with the receivers facing down. The left 3 emitters are all on in the 1st 4 steps, but the receivers are only on in steps 2 to 4. Luckily, both receivers have the same behaviour in these steps. So, the right 3 inputs have to send the information determining whether the receivers are on or off in these steps. A single laser from the right will do it, processed to be off in the first step and on in steps 2 to 4, provided input from the left is blocked in step 1. In steps 5, 7 and 8 only the left receiver is on, so a single laser on will determine its fate, but in addition input to the other receiver must be blocked. In step 6 both receivers are off, so inputs must be blocked.

The two small square 2 x 2 platforms at the top are too small to allow both inputs from a 2 input logic gate to be directed from the nearest large platform near inputs. But IF gates (input and side impact from any combo of the large platforms) and 2 input logic gates with 1 input from the near large platform and one, indirectly, from the other are possible.

Apart from that, you're on your own how to solve it.
Last edited by dholland; 16 Nov, 2015 @ 5:30am
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dholland 27 Nov, 2015 @ 9:08am 
I figured out a better solution, after looking for more patterns. The info from the right in the first 4 steps to both receivers has to be off in the first step, on in the others. This could be done either with an XOR on the right, or an XOR on the left with an IF gate to transfer to the right. In steps 2 and 8, right side is fixed but right receiver varies, so info from the left to right receiver which must be off in step 8, but not step 2. Similarly for steps 3 and 5, and steps 4 and 7. Also, in step 6 both receivers are off, so the info paths from left and right must be blocked. A simple way to get a right signal is to XOR the 2 emitters in step 6 (to be off) and the signal is on in steps 2 to 4. Can you figure out logic for the left inputs and how to communicate between left and right for when the receivers have different states, and what to do with the other input on the right? I solved it in 16 devices.
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