diff --git a/progress.png b/progress.png
index 6451369..22cb021 100644
Binary files a/progress.png and b/progress.png differ
diff --git a/progress.yaml b/progress.yaml
index 93e1eaa..25b5bfc 100644
--- a/progress.yaml
+++ b/progress.yaml
@@ -11,4 +11,6 @@
 6:
   stars: 2
 7:
-  stars: 2
\ No newline at end of file
+  stars: 2
+8:
+  stars: 1
\ No newline at end of file
diff --git a/res/examples/day8.txt b/res/examples/day8.txt
new file mode 100644
index 0000000..de0f909
--- /dev/null
+++ b/res/examples/day8.txt
@@ -0,0 +1,12 @@
+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............
\ No newline at end of file
diff --git a/src/day8/puzzle1.typ b/src/day8/puzzle1.typ
new file mode 100644
index 0000000..822e1a2
--- /dev/null
+++ b/src/day8/puzzle1.typ
@@ -0,0 +1,51 @@
+#import "/src/utils.typ": *
+
+#let in-grid(w, h, x, y) = {
+  return 0 <= x and x < w and 0 <= y and y < h
+}
+
+#let solve(input) = {
+  let by-freq = (:)
+  let antinodes = ()
+
+  let grid = input.split("\n").map(l => l.clusters())
+  let w = grid.first().len()
+  let h = grid.len()
+
+  let in-grid = in-grid.with(w, h)
+
+  for y in range(h) {
+    for x in range(w) {
+      let c = grid.at(y).at(x)
+      if c == "." {
+        continue
+      }
+      if c not in by-freq {
+        by-freq.insert(c, ())
+      }
+
+      for (x2, y2) in by-freq.at(c) {
+        let (dx, dy) = (x2 - x, y2 - y)
+        let node1 = (x - dx, y - dy)
+        let node2 = (x2 + dx, y2 + dy)
+
+        if in-grid(..node1) and node1 not in antinodes {
+          antinodes.push(node1)
+        }
+
+        if in-grid(..node2) and node2 not in antinodes {
+          antinodes.push(node2)
+        }
+      }
+      by-freq.at(c).push((x, y))
+    }
+  }
+
+  return antinodes.len()
+}
+
+#show-puzzle(
+  8, 1,
+  solve,
+  example: 14
+)
\ No newline at end of file
diff --git a/src/day8/puzzle2.typ b/src/day8/puzzle2.typ
new file mode 100644
index 0000000..e69de29
diff --git a/src/main.pdf b/src/main.pdf
index 9aae509..16ab2a2 100644
Binary files a/src/main.pdf and b/src/main.pdf differ