diff --git a/platform/bin/platform.uw8 b/platform/bin/platform.uw8
index a96c6f0..b51d958 100644
Binary files a/platform/bin/platform.uw8 and b/platform/bin/platform.uw8 differ
diff --git a/platform/src/platform.cwa b/platform/src/platform.cwa
index a7eb506..85f0c76 100644
--- a/platform/src/platform.cwa
+++ b/platform/src/platform.cwa
@@ -136,6 +136,58 @@ export fn circle(cx: f32, cy: f32, radius: f32, col: i32) {
     }
 }
 
+export fn circle_outline(cx: f32, cy: f32, radius: f32, col: i32) {
+    let prev_w: f32;
+    let y = clamp(nearest(cy - radius) as i32, -1, 241);
+    let maxY = clamp(nearest(cy + radius) as i32, -1, 241);
+    
+    loop lines {
+        let lazy dy = y as f32 - cy + 0.5;
+        let inline q = radius * radius - dy * dy;
+        let w = sqrt(max(0 as f32, q));
+
+        let xlp = nearest(cx - prev_w) as i32;
+        let xl = nearest(cx - w) as i32;
+        let xrp = nearest(cx + prev_w) as i32;
+        let xr = nearest(cx + w) as i32;
+        if w >= prev_w {
+            if xl < xlp {
+                hline(xl, xlp, y, col);
+            } else {
+                if xl < xr {
+                    setPixel(xl, y, col);
+                }
+            }
+            if xr > xrp {
+                hline(xrp, xr, y, col);
+            } else {
+                if xl < xr {
+                    setPixel(xr - 1, y, col);
+                }
+            }
+        } else {
+            if xl > xlp {
+                hline(xlp, xl, y - 1, col);
+            } else {
+                if xlp < xrp {
+                    setPixel(xlp, y - 1, col);
+                }
+            }
+            if xr < xrp {
+                hline(xr, xrp, y - 1, col);
+            } else {
+                if xlp < xrp {
+                    setPixel(xrp - 1, y - 1, col);
+                }
+            }
+        }
+
+        y = y + 1;
+        prev_w = w;
+        branch_if y <= maxY: lines;
+    }
+}
+
 export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
     let swapTmp: f32;
     if x1 > x2 {