diff --git a/CHANGELOG.md b/CHANGELOG.md
index 011b04a..3cdba8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 Game store page: https://crispypin.itch.io/marble-machinations
 
 ## [unreleased]
+### fixed
+- broken area calculation causing crash when completing a level with a machine wider than it is tall
 
 ## v0.3.0 - 2025-04-04
 ### added
diff --git a/src/marble_engine/grid.rs b/src/marble_engine/grid.rs
index 1e0bc8d..63f2f64 100644
--- a/src/marble_engine/grid.rs
+++ b/src/marble_engine/grid.rs
@@ -124,9 +124,9 @@ impl Grid {
 	}
 
 	pub fn used_bounds_area(&self) -> usize {
-		let row_clear = |a, max, f: fn(usize, usize) -> (usize, usize)| {
-			for b in 0..max {
-				if !self.get_unchecked(f(a, b).into()).is_blank() {
+		let row_clear = |y| {
+			for x in 0..self.width {
+				if !self.get_unchecked((x, y).into()).is_blank() {
 					return false;
 				}
 			}
@@ -134,29 +134,37 @@ impl Grid {
 		};
 		let mut height = self.height;
 		for y in 0..self.height {
-			if row_clear(y, self.width, |y, x| (x, y)) {
+			if row_clear(y) {
 				height -= 1;
 			} else {
 				break;
 			}
 		}
 		for y in (0..self.height).rev() {
-			if row_clear(y, self.width, |y, x| (x, y)) {
+			if row_clear(y) {
 				height -= 1;
 			} else {
 				break;
 			}
 		}
+		let col_clear = |x| {
+			for y in 0..self.height {
+				if !self.get_unchecked((x, y).into()).is_blank() {
+					return false;
+				}
+			}
+			true
+		};
 		let mut width = self.width;
 		for x in 0..self.width {
-			if row_clear(x, self.height, |x, y| (x, y)) {
+			if col_clear(x) {
 				width -= 1;
 			} else {
 				break;
 			}
 		}
 		for x in (0..self.width).rev() {
-			if row_clear(x, self.width, |x, y| (x, y)) {
+			if col_clear(x) {
 				width -= 1;
 			} else {
 				break;