diff --git a/README.md b/README.md
index 7eed949..5e8db07 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@
 |  9  | Movie Theater       |   ⭐   |   🌓   |
 |  10 | Factory             |   ⭐   |   ⏱️   |
 |  11 | Reactor             |   ⭐   |        |
+|  12 | Christmas Tree Farm |        |        |
 
 ### Symbols
 
diff --git a/src/__tests__/day_12_test.ts b/src/__tests__/day_12_test.ts
new file mode 100644
index 0000000..85fc278
--- /dev/null
+++ b/src/__tests__/day_12_test.ts
@@ -0,0 +1,7 @@
+import { read_situation_summary } from "../exercises/day_12.ts";
+
+Deno.test("Day 12 - A", async () => {
+  const summary = await read_situation_summary(
+    "src/exercises/assets/day_12_test_input.txt",
+  );
+});
diff --git a/src/exercises/assets/day_12_test_input.txt b/src/exercises/assets/day_12_test_input.txt
new file mode 100644
index 0000000..e5e1b3d
--- /dev/null
+++ b/src/exercises/assets/day_12_test_input.txt
@@ -0,0 +1,33 @@
+0:
+###
+##.
+##.
+
+1:
+###
+##.
+.##
+
+2:
+.##
+###
+##.
+
+3:
+##.
+###
+##.
+
+4:
+###
+#..
+###
+
+5:
+###
+.#.
+###
+
+4x4: 0 0 0 0 2 0
+12x5: 1 0 1 0 2 2
+12x5: 1 0 1 0 3 2
diff --git a/src/exercises/day_11.ts b/src/exercises/day_11.ts
index 094ce0f..977832d 100644
--- a/src/exercises/day_11.ts
+++ b/src/exercises/day_11.ts
@@ -36,6 +36,35 @@ export function count_all_out_paths(list: Device[], init: string): number {
   return total;
 }
 
+// const REQUIREMENT_1 = "fft";
+// const REQUIREMENT_2 = "dac";
+// export function find_all_out_complex_paths(
+//   list: Device[],
+//   init: string,
+//   path: string[],
+// ): string[][] {
+//   let total = 0;
+//   const current_device = list.find((d) => d.name === init);
+//
+//   // Default exits
+//   // NOTE: how to avoid circular connections
+//   if (!current_device) {
+//     return [];
+//   }
+//   if (current_device.output_list.length < 1) {
+//     return 0;
+//   }
+//   if (current_device.output_list.includes(END)) {
+//     return 1;
+//   }
+//
+//   current_device.output_list.forEach((output) => {
+//     total += count_all_out_paths(list, output);
+//   });
+//
+//   return total;
+// }
+
 export async function read_device_list(path: string): Promise<Device[]> {
   const txt_file = await Deno.readTextFile(path);
   const raw_device_list = txt_file.split("\n");
diff --git a/src/exercises/day_12.ts b/src/exercises/day_12.ts
new file mode 100644
index 0000000..da0ac00
--- /dev/null
+++ b/src/exercises/day_12.ts
@@ -0,0 +1,88 @@
+enum Point {
+  FILLED = "#",
+  EMPTY = ".",
+}
+
+type Present = Point[][];
+type Region = {
+  width: number;
+  height: number;
+};
+interface Tree {
+  region: Region;
+  presents: number[];
+}
+
+interface SituationSummary {
+  presents: Present[];
+  trees: Tree[];
+}
+
+export default async function ChristmasTreeFarm() {
+}
+
+function do_presents_fit(tree: Tree, presents: Present[]): boolean {
+}
+
+function do_present_pair_fit(tree: Tree, p_a: Present, p_b: Present): boolean {
+}
+
+function rotate_present_90_deg(present: Present): Present {
+}
+
+function flip_present_horizontal(present: Present): Present {
+}
+
+function flip_present_vertical(present: Present): Present {
+}
+
+export async function read_situation_summary(
+  path: string,
+): Promise<SituationSummary> {
+  const txt_input = await Deno.readTextFile(path);
+  // NOTE: should be done with splits to avoid performance issues on final sample
+  const block_list = txt_input.split("\n\n");
+
+  const present_list: Present[] = [];
+  const tree_list: Tree[] = [];
+
+  block_list.forEach((block) => {
+    if (block.includes("x")) {
+      // Tree
+      const raw_trees = block.split("\n");
+      raw_trees.forEach((t) => {
+        if (!t || t.length < 1) {
+          return;
+        }
+        const [raw_region, raw_presents] = t.split(": ");
+        const region: Tree["region"] = {
+          width: parseInt(raw_region.split("x")[0]),
+          height: parseInt(raw_region.split("x")[1]),
+        };
+        const presents: Tree["presents"] = raw_presents.split(" ").map((p) => {
+          const p_n = parseInt(p);
+          if (p_n === p_n) {
+            return p_n;
+          }
+          return undefined;
+        }).filter((p) => p !== undefined);
+
+        tree_list.push({ region, presents });
+      });
+    } else {
+      // Present
+      const raw_present = block.split("\n").slice(1);
+      const present: Present = raw_present.map((line) =>
+        line.split("").map((p) =>
+          p === Point.FILLED ? Point.FILLED : Point.EMPTY
+        )
+      );
+      present_list.push(present);
+    }
+  });
+
+  return {
+    presents: present_list,
+    trees: tree_list,
+  };
+}