diff --git a/source/game.js b/source/game.js
index 5486f29..6e643e1 100644
--- a/source/game.js
+++ b/source/game.js
@@ -86,34 +86,29 @@ function update_bird() {
 	wii.grrlib.draw_img(0, bird.position, nonNull(bird.texture), 0, 1, 1, WHITE_COLOR);
 }
 
-function create_pipe() {
+function Pipe() {
 	const top_max = 200;
 	const top_y = random_range(0, top_max);
 
 	wii.grrlib.draw_img(100, -top_y, nonNull(pipe_flipped), 0, 1, 1, WHITE_COLOR);
 	wii.grrlib.draw_img(100, top_y + 400, nonNull(pipe), 0, 1, 1, WHITE_COLOR);
 
-	return {
-		top_y: -top_y,
-		bottom_y: -top_y + 400,
-		position: 650,
-		time_active: 0
-	}
+	this.top_y = -top_y
+	this.bottom_y = -top_y + 400
+	this.position = 650
+	this.time_active = 0
 }
 
-/** 
- * @param {Pipe} pipe
- */
-function update_pipe(pipe) {
-	if (pipe.time_active >= PIPE_MAX_TIME) {
-		const index = pipes.indexOf(pipe);
+Pipe.prototype.update = function () {
+	if (this.time_active >= PIPE_MAX_TIME) {
+		const index = pipes.indexOf(this);
 		pipes.splice(index, -1);
 		return;
 	}
-	wii.grrlib.draw_img(pipe.position, pipe.top_y, nonNull(pipe_flipped), 0, 1, 1, WHITE_COLOR);
-	wii.grrlib.draw_img(pipe.position, pipe.bottom_y, nonNull(globalThis.pipe), 0, 1, 1, WHITE_COLOR);
-	pipe.position -= 100 * wii.get_deltatime();
-	pipe.time_active += wii.get_deltatime();
+	wii.grrlib.draw_img(this.position, this.top_y, nonNull(pipe_flipped), 0, 1, 1, WHITE_COLOR);
+	wii.grrlib.draw_img(this.position, this.bottom_y, nonNull(pipe), 0, 1, 1, WHITE_COLOR);
+	this.position -= 100 * wii.get_deltatime();
+	this.time_active += wii.get_deltatime();
 }
 
 function update() {
@@ -133,13 +128,13 @@ function update() {
 	}
 
 	if (timer == 0) {
-		pipes.push(create_pipe());
+		pipes.push(new Pipe());
 	}
 
 	wii.grrlib.draw_img(0, 0, nonNull(background), 0, 1, 1, WHITE_COLOR);
 	update_bird();
 	for (var i = 0; i < pipes.length; i++) {
-		update_pipe(pipes[i]);
+		pipes[i].update();
 	}
 	wii.print("deltatime: " + wii.get_deltatime())
 	globalThis.timer += wii.get_deltatime();
diff --git a/types.d.ts b/types.d.ts
index d7a9d1e..9371fec 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -7,12 +7,6 @@ declare interface FilePtr {
 declare interface GRRLibTexture {
 	__brand: "GRRLibTexture"
 }
-declare interface Pipe {
-	top_y: number
-	bottom_y: number
-	position: number
-	time_active: number
-};
 
 declare namespace wii {
 	function print(message: string): void