diff --git a/builtins.ts b/builtins.ts
index 8e36ec6..2e4a9fa 100644
--- a/builtins.ts
+++ b/builtins.ts
@@ -3,6 +3,8 @@ import {
 	clearScreen,
 	fillRect,
 cameraPos,
+fillCircle,
+outlineCircle,
 } from "./window.ts";
 import { Font, font } from "./font.ts";
 import { keyDown, keyPressed, keyReleased } from "./keyboard.ts";
@@ -92,6 +94,8 @@ const faux = {
 	txt: drawText,
 	rectfill: fillRect,
 	rect: outlineRect,
+	circfill: fillCircle,
+	circ: outlineCircle,
 	map: (mapSheet: number, tileX: number, tileY: number, screenX: number, screenY: number, tileW: number, tileH: number) => {
 		const originalSpritesheet = getSpritesheet() ?? 0;
 		getMapSheet(mapSheet).forEach(([sprSheet, spr], i) => {
diff --git a/carts/tmp/circ.fx b/carts/tmp/circ.fx
new file mode 100644
index 0000000..8f70c7d
--- /dev/null
+++ b/carts/tmp/circ.fx
@@ -0,0 +1 @@
+[{"sheet_type":"code","value":"// Sample\n\nlet r = 0;\nlet d = 1;\nreturn {\n\tinit() {},\n\tupdate() {\n\t\tif (r >= 20) {\n\t\t\td = -1;\n\t\t} else if (r < 0) {\n\t\t\td = 1;\n\t\t}\n\t\tr += d*0.1;\t\n\t},\n\tdraw() {\n\t\tcls();\n\t\tcirc(50, 50, 6, 17);\n\t\ttxt(10,10,\"Hello, World!\");\n\t}\n}"},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null},{"sheet_type":"none","value":null}]
\ No newline at end of file
diff --git a/pico8_builtins.txt b/pico8_builtins.txt
index 997b1e7..6be41b5 100644
--- a/pico8_builtins.txt
+++ b/pico8_builtins.txt
@@ -27,8 +27,8 @@
 - [ ] color
 - [x] cls
 - [x] camera
-- [ ] circ
-- [ ] circfill
+- [x] circ
+- [x] circfill
 - [ ] oval
 - [ ] ovalfill
 - [ ] line
diff --git a/window.ts b/window.ts
index 4727ff2..af9bb8d 100644
--- a/window.ts
+++ b/window.ts
@@ -144,7 +144,7 @@ export const setPixelColorRaw = (x: number, y: number, color: number) => {
 }
 
 export const setPixelColor = (x: number, y: number, color: number) => {
-	return setPixelColorRaw(x - cameraPos.x, y - cameraPos.y, color);
+	return setPixelColorRaw(Math.floor(x - cameraPos.x), Math.floor(y - cameraPos.y), color);
 }
 
 export const setPixelsInRect = (x: number, y: number, w: number, pixels: Array<number>) => {
@@ -163,6 +163,37 @@ export const fillRect = (x: number, y: number, w: number, h: number, color: numb
 	setPixelsInRect(x, y, w, Array(w*h).fill(color));
 }
 
+export const fillCircle = (x: number, y: number, r: number, color: number) => {
+	const left = Math.floor(x-r-1);
+	const top = Math.floor(y-r-1);
+	for (let i = left; i <= Math.ceil(x+r+1); i ++) {
+		for (let j = top; j <= Math.ceil(y+r+1); j ++) {
+			if (Math.sqrt((x-i)**2 + (y-j)**2) <= r+0.5) {
+				setPixelColor(i, j, color);
+			}
+		}
+	}
+}
+
+export const outlineCircle = (x: number, y: number, r: number, color: number) => {
+	const left = Math.floor(x-r-1);
+	const top = Math.floor(y-r-1);
+	const inR = (d: number) => d <= r+0.5 && d > r-0.5;
+	for (let i = left; i <= Math.ceil(x+r+1); i ++) {
+		for (let j = top; j <= Math.ceil(y+r+1); j ++) {
+			const d = Math.sqrt((x-i)**2 + (y-j)**2);
+			if (inR(d)) {
+				const dh = Math.sqrt((x-(i+Math.sign(i-x)))**2 + (y-j)**2);
+				const dv = Math.sqrt((x-i)**2 + (y-(j+Math.sign(j-y)))**2);
+				const h = Math.abs(x-i) > Math.abs(y-j);
+				if (!inR(h ? dh : dv)) {
+					setPixelColor(i, j, color);
+				}
+			}
+		}
+	}
+}
+
 export const fillRectRaw = (x: number, y: number, w: number, h: number, color: number) => {
 	setPixelsInRectRaw(x, y, w, Array(w*h).fill(color));
 }