diff --git a/src/main.rs b/src/main.rs
index c6be92f..4cf489c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,10 +32,12 @@ mod day14;
 mod day15;
 #[allow(dead_code)]
 mod day16;
+#[allow(dead_code)]
 mod day17;
+mod day18;
 
 fn main() {
-    day17::day17();
+    day18::day18();
 }
 
 pub fn input(day: u8) -> String {
diff --git a/src/util/maps.rs b/src/util/maps.rs
index 19ef915..e7e36a2 100644
--- a/src/util/maps.rs
+++ b/src/util/maps.rs
@@ -154,9 +154,20 @@ where
     }
 
     pub fn map<U: Copy, F: Fn(&T) -> U>(&self, f: F) -> World<U> {
-        let v = self.map.iter().map(|row| row.iter().map(|e| f(e)).collect()).collect();
+        let v = self
+            .map
+            .iter()
+            .map(|row| row.iter().map(|e| f(e)).collect())
+            .collect();
         World::<U>::from_2d_vec(v)
     }
+
+    pub fn adjacent_locations(&self, x: usize, y: usize) -> Vec<(usize, usize)> {
+        Direction::all_variants()
+            .into_iter()
+            .filter_map(|d| self.travel(x, y, d))
+            .collect()
+    }
 }
 
 impl<T> Display for World<T>