diff --git a/07/input b/07/input
new file mode 100644
index 0000000..0ff99e5
--- /dev/null
+++ b/07/input
@@ -0,0 +1,1000 @@
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diff --git a/07/main.go b/07/main.go
new file mode 100644
index 0000000..321d2ff
--- /dev/null
+++ b/07/main.go
@@ -0,0 +1,124 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"sort"
+	"strings"
+
+	"git.z1glr.de/advent-of-code-2025/pkg/aoc"
+)
+
+type Point struct {
+	X, Y, Z int
+	Parent  *Point
+	Size    int
+}
+
+func (p *Point) DistanceTo(p2 *Point) float64 {
+	return math.Sqrt(float64((p.X-p2.X)*(p.X-p2.X) + (p.Y-p2.Y)*(p.Y-p2.Y) + (p.Z-p2.Z)*(p.Z-p2.Z)))
+}
+
+func (p *Point) GetRoot() *Point {
+	if p.Parent == nil || p.Parent == p {
+		return p
+	} else {
+		return p.GetRoot()
+	}
+}
+
+func PointFromString(s string) Point {
+	parts := strings.Split(s, ",")
+
+	return Point{
+		X:    aoc.ParseInt(parts[0]),
+		Y:    aoc.ParseInt(parts[1]),
+		Z:    aoc.ParseInt(parts[2]),
+		Size: 1,
+	}
+}
+
+type Connection struct {
+	Length float64
+	P1, P2 *Point
+}
+
+func do(test bool) (int, int) {
+	rows := aoc.ReadFileRows(test)
+
+	points := make([]Point, len(rows))
+
+	for ii, rr := range rows {
+		points[ii] = PointFromString(rr)
+	}
+
+	connections := []Connection{}
+
+	for ii, p1 := range points {
+		for _, p2 := range points[ii+1:] {
+			connections = append(connections, Connection{
+				Length: p1.DistanceTo(&p2),
+				P1:     &p1,
+				P2:     &p2,
+			})
+		}
+	}
+
+	// sort distances by length
+	sort.Slice(connections, func(i, j int) bool { return connections[i].Length < connections[j].Length })
+
+	for _, cc := range connections[:10] {
+		fmt.Println(*cc.P1)
+		fmt.Println(*cc.P2)
+
+		// if both have no parent, make the first one as the parent
+		if cc.P1.Parent == nil && cc.P2.Parent == nil {
+			cc.P1.Parent = cc.P1
+			cc.P2.Parent = cc.P1
+
+			cc.P1.Size++
+
+			// fmt.Println(cc.P2.GetRoot().Size)
+
+			// if the second one has no parent, connect it to the first one
+		} else if cc.P2.Parent == nil {
+			cc.P2.Parent = cc.P1
+
+			cc.P1.GetRoot().Size++
+		} else if cc.P1.Parent == nil {
+			cc.P1.Parent = cc.P2
+
+			cc.P2.GetRoot().Size++
+
+			// both have a parent -> make the parent of p2's root p1
+		} else {
+			p2OldSize := cc.P2.GetRoot().Size
+
+			cc.P2.GetRoot().Parent = cc.P1
+
+			cc.P1.GetRoot().Size += p2OldSize
+		}
+	}
+
+	roots := []Point{}
+
+	for _, pp := range points {
+		if pp.GetRoot() == &pp {
+			roots = append(roots, pp)
+		}
+	}
+
+	sort.Slice(roots, func(i, j int) bool { return roots[i].Size < roots[j].Size })
+
+	res1 := roots[0].Size * roots[1].Size * roots[2].Size
+
+	fmt.Println(res1)
+
+	return res1, 0
+}
+
+func main() {
+	if r1, r2 := do(true); r1 == 40 && r2 == 0 {
+		do(false)
+	}
+}
diff --git a/07/test b/07/test
new file mode 100644
index 0000000..e98a3b6
--- /dev/null
+++ b/07/test
@@ -0,0 +1,20 @@
+162,817,812
+57,618,57
+906,360,560
+592,479,940
+352,342,300
+466,668,158
+542,29,236
+431,825,988
+739,650,466
+52,470,668
+216,146,977
+819,987,18
+117,168,530
+805,96,715
+346,949,466
+970,615,88
+941,993,340
+862,61,35
+984,92,344
+425,690,689