diff --git a/maze/src/lib.rs b/maze/src/lib.rs
index 69d90d7..fe02044 100644
--- a/maze/src/lib.rs
+++ b/maze/src/lib.rs
@@ -502,8 +502,8 @@ impl<const X: usize, const Y: usize, const SIZE: usize> BinaryMap<X, Y, SIZE> {
         }
     }
 
-    pub fn lines(&self) -> impl Iterator<Item = &[MazePart]> {
-        self.0.windows(X)
+    pub fn rows(&self) -> impl Iterator<Item = &[MazePart]> {
+        self.0.windows(X).step_by(X)
     }
 
     ///   0 1 2
@@ -539,7 +539,22 @@ mod column_iter_tests {
     use super::*;
 
     #[test]
-    fn check() {
+    fn rows() {
+        let grid = [
+            1, 2, 3, //
+            4, 5, 6, //
+            7, 8, 9, //
+            10, 11, 12, //
+        ];
+        let mut it = grid.windows(3).step_by(3);
+        assert_eq!(it.next().map(Vec::from), Some(vec![1, 2, 3]));
+        assert_eq!(it.next().map(Vec::from), Some(vec![4, 5, 6]));
+        assert_eq!(it.next().map(Vec::from), Some(vec![7, 8, 9]));
+        assert_eq!(it.next().map(Vec::from), Some(vec![10, 11, 12]));
+        assert_eq!(it.next(), None);
+    }
+    #[test]
+    fn cols() {
         let grid = [
             1, 2, 3, //
             4, 5, 6, //