Game Guide
Nexus in MyRin asks you to connect matching dots so that every cell in the grid is filled, with no paths crossing. Here is the systematic approach that solves any level.
At first glance, Nexus looks like a drawing game. A grid, some colored dots in pairs, and your job is to connect each pair with a line. What makes this a pure logic puzzle, not a creative doodling exercise, is a constraint that beginners often overlook: every cell in the grid must be used. No empty space allowed. No path can share a cell with another. No crossings.
That combination of constraints is not just a difficulty modifier. It transforms the problem entirely. The blank cells are not empty space, they are information. They tell you exactly where each path must go. Once you learn to read the grid this way, the puzzle is not about drawing; it is about deduction.
Take a simple example: a 4×4 grid with two pairs of dots. If you connect the pairs with short paths, you might have eight filled cells and eight empty ones. That violates the rules, but more importantly, it leaves valid solutions unexplored. The constraint forces both paths to be longer than they need to be. This means the paths must take specific routes to collectively cover all 16 cells. The routing is determined by the combination of dot positions and cell count, not by free choice.
At higher levels, a 9×9 grid with eight or more pairs has a single valid solution. Not because the puzzle designer chose one from many, but because the constraints produce logical necessity. Every path position can, in principle, be determined without trial and error, by deduction alone.
This is what makes Nexus a logic puzzle and not a maze. Mazes have one open path to find. Nexus has a space-filling constraint that forces every path length to be exactly right.
A dot in a corner has only two neighbors. If both of those neighbors must be reached by different paths (because their colors are already determined), the corner dot's path is forced: it must exit through the only available cell. Start every puzzle by scanning corner and edge dots. They have the fewest degrees of freedom and yield the most immediate deductions.
In a standard grid, cells can be colored like a checkerboard, alternating black and white. Every path of odd length starts and ends on cells of the same color. Every path of even length starts and ends on cells of different colors. This coloring rule is a powerful filter: if two dots of the same color are on the same checkerboard-color cell, their connecting path must be even in length. This tells you something about how the path must route even before you draw a single cell.
This technique becomes intuitive after repeated use. You stop consciously applying the checkerboard rule and simply feel when a proposed path "goes the wrong direction."
A bottleneck is a cell (or narrow column of cells) that all remaining unfilled paths must pass through. If a section of the grid can only be reached by one color's path, that path must cover that section. Identifying bottlenecks lets you commit large sections of a path without solving the endpoints first, you know where the path must go, even if you don't yet know where it starts and finishes.
At Nexus difficulty levels 100 and above, the entire solution structure often becomes visible through bottleneck analysis alone. The paths are not drawn from endpoint to endpoint but assembled from middle sections inward.
Starting with the longest paths. Long paths are tempting to establish first because they seem to define the space. This is usually wrong. Long paths are flexible, they can route many ways. Short paths between dots that are close together have fewer options. Start with the most constrained (shortest, most cornered) connections and let the longer paths fill the remaining space.
Ignoring empty-cell accounting. After connecting a few pairs, count how many cells remain and how many pairs still need connection. If the remaining pairs cannot collectively fill the remaining cells without producing an unusually long path for one of them, you have made an earlier error. Cell counting catches mistakes before they compound.
Crossing over a path to "save" it later. Some players draw a near-complete path and plan to "come back" to it after solving other pairs. The no-crossing rule prevents this. Commit to a path routing only when you have enough information to confirm it. An uncommitted path should stay undrawn rather than partially drawn.
Cognitive research on spatial reasoning distinguishes between several sub-skills. One is closure: the ability to hold a partially complete spatial structure in working memory and mentally fill in the missing pieces. Closure is what lets architects read a 2D floor plan and see a 3D building, or what lets you complete an unfinished sentence from its opening words.
Nexus trains spatial closure intensively. As you work a puzzle, you are constantly holding partial paths in mind, projecting their possible extensions, and evaluating which projections are compatible with the global fill-all-cells constraint. This is not a skill that develops automatically, it improves with practice, and practiced spatial closure transfers to navigation, technical reading, and 3D reasoning in other contexts.
MyRin's Japan layer includes the concept of ma (間), the Japanese aesthetic of meaningful negative space. In architecture, ma is the pause between two pillars. In haiku, it is the silence between images. In music, it is the gap between notes that gives the melody shape.
Nexus reverses this: its constraint is the elimination of negative space. Every cell must be filled. There is no ma in a solved Nexus puzzle, only complete, continuous paths with no gaps. This inversion is itself aesthetically meaningful. The beauty of a completed grid comes from the same principle that governs ma: the shape of what is present reveals itself through the shape of what is not. You understand the paths fully only when all the empty cells are gone.
Before the solution is reached, those empty cells are a kind of negative space, the undefined regions that pressure and direct the paths toward their final form. Ma and Nexus are opposites in structure and the same in function: both use negative space as the active element that gives the visible structure its meaning.