diff --git a/AdventOfCode2025/Inputs/Day8_0.txt b/AdventOfCode2025/Inputs/Day8_0.txt
new file mode 100644
index 0000000..20c6fd2
--- /dev/null
+++ b/AdventOfCode2025/Inputs/Day8_0.txt
@@ -0,0 +1,20 @@
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\ No newline at end of file
diff --git a/AdventOfCode2025/Inputs/Day8_1.txt b/AdventOfCode2025/Inputs/Day8_1.txt
new file mode 100644
index 0000000..ca6f30e
--- /dev/null
+++ b/AdventOfCode2025/Inputs/Day8_1.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/AdventOfCode2025/Solutions/Day8.cs b/AdventOfCode2025/Solutions/Day8.cs
new file mode 100644
index 0000000..d3d7744
--- /dev/null
+++ b/AdventOfCode2025/Solutions/Day8.cs
@@ -0,0 +1,165 @@
+namespace AdventOfCode2025.Solutions;
+
+public class Day8() : Solution(8)
+{
+    public override string SolvePart1()
+    {
+        List<JunctionBox> boxes = Input
+            .Lines
+            .Select(line => line.Split(','))
+            .Select(parts => new JunctionBox(long.Parse(parts[0]), long.Parse(parts[1]), long.Parse(parts[2])))
+            .ToList();
+
+        IOrderedEnumerable<(JunctionBox Box1, JunctionBox Box2, long Distance)> allPairs = CreateAllPairs(boxes).OrderBy(pair => pair.Distance);
+
+        const int numberOfConnections = 1000;
+        var countConnections = 0;
+
+        foreach (var (box1, box2, _) in allPairs)
+        {
+            if (countConnections >= numberOfConnections)
+            {
+                break;
+            }
+
+            box1.ConnectTo(box2);
+            countConnections++;
+        }
+
+        IEnumerable<int> networkSizes = boxes
+            .Select(b => b.Network)
+            .Where(n => n is not null)
+            .Distinct()
+            .Select(n => n!.Boxes.Count)
+            .OrderByDescending(size => size);
+
+        return networkSizes
+            .Take(3)
+            .Aggregate(1, (a, b) => a * b)
+            .ToString();
+    }
+
+    public override string SolvePart2()
+    {
+        List<JunctionBox> boxes = Input
+            .Lines
+            .Select(line => line.Split(','))
+            .Select(parts => new JunctionBox(long.Parse(parts[0]), long.Parse(parts[1]), long.Parse(parts[2])))
+            .ToList();
+
+        IOrderedEnumerable<(JunctionBox Box1, JunctionBox Box2, long Distance)> allPairs = CreateAllPairs(boxes).OrderBy(pair => pair.Distance);
+
+        JunctionBox? lastBox1 = null;
+        JunctionBox? lastBox2 = null;
+
+        foreach (var (box1, box2, _) in allPairs)
+        {
+            if (!box1.ConnectTo(box2))
+            {
+                continue;
+            }
+
+            lastBox1 = box1;
+            lastBox2 = box2;
+
+            var isolatedBoxes = boxes.Count(b => b.Network is null);
+            var distinctNetworks = boxes
+                .Select(b => b.Network)
+                .Where(n => n is not null)
+                .Distinct()
+                .Count();
+
+            var totalCircuits = isolatedBoxes + distinctNetworks;
+            if (totalCircuits == 1)
+            {
+                break;
+            }
+        }
+
+        return (lastBox1!.X * lastBox2!.X).ToString();
+    }
+
+    private static IEnumerable<(JunctionBox Box1, JunctionBox Box2, long Distance)> CreateAllPairs(List<JunctionBox> boxes)
+    {
+        List<(JunctionBox Box1, JunctionBox Box2, long Distance)> pairs = [];
+        for (var i = 0; i < boxes.Count; i++)
+        {
+            for (var j = i + 1; j < boxes.Count; j++)
+            {
+                var box1 = boxes[i];
+                var box2 = boxes[j];
+                var distance = box1.DistanceTo(box2);
+                pairs.Add((box1, box2, distance));
+            }
+        }
+
+        return pairs;
+    }
+
+    private sealed class Network
+    {
+        public readonly List<JunctionBox> Boxes = [];
+    }
+
+    private sealed record JunctionBox(long X, long Y, long Z)
+    {
+        public Network? Network { get; set; }
+
+        public long DistanceTo(JunctionBox other)
+        {
+            var dx = X - other.X;
+            var dy = Y - other.Y;
+            var dz = Z - other.Z;
+            return dx * dx + dy * dy + dz * dz;
+        }
+
+        public bool ConnectTo(JunctionBox other)
+        {
+            if (BothNotInNetwork())
+            {
+                var newNetwork = new Network();
+                newNetwork.Boxes.Add(this);
+                newNetwork.Boxes.Add(other);
+                Network = newNetwork;
+                other.Network = newNetwork;
+            }
+            else if (OnlyOtherInNetwork())
+            {
+                other.Network!.Boxes.Add(this);
+                Network = other.Network;
+            }
+            else if (OnlyThisInNetwork())
+            {
+                Network!.Boxes.Add(other);
+                other.Network = Network;
+            }
+            else if (NotInSameNetwork())
+            {
+                var target = Network!.Boxes.Count >= other.Network!.Boxes.Count ? Network : other.Network!;
+                var source = target == Network ? other.Network! : Network;
+
+                var sourceBoxes = new List<JunctionBox>(source.Boxes);
+                source.Boxes.Clear();
+
+                foreach (var box in sourceBoxes)
+                {
+                    box.Network = target;
+                    target.Boxes.Add(box);
+                }
+            }
+            else
+            {
+                // Already connected
+                return false;
+            }
+
+            return true;
+
+            bool BothNotInNetwork() => Network is null && other.Network is null;
+            bool OnlyThisInNetwork() => Network is not null && other.Network is null;
+            bool OnlyOtherInNetwork() => Network is null && other.Network is not null;
+            bool BothInNetwork() => Network is not null && other.Network is not null;
+            bool NotInSameNetwork() => BothInNetwork() && Network != other.Network;
+        }
+    }
+}
\ No newline at end of file