diff --git a/src/editor.rs b/src/editor.rs
index 0e8db05..1af0ef3 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -111,7 +111,7 @@ impl Editor {
 	}
 
 	pub fn level_id(&self) -> &str {
-		&self.level.id()
+		self.level.id()
 	}
 
 	pub fn source_board(&self) -> &Board {
diff --git a/src/main.rs b/src/main.rs
index 37f9e09..0f5f4d0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -44,8 +44,8 @@ fn main() {
 impl Game {
 	fn new(rl: &mut RaylibHandle, thread: &RaylibThread) -> Self {
 		let mut textures = Textures::default();
-		textures.load_dir("assets", rl, &thread);
-		textures.load_dir("assets/tiles", rl, &thread);
+		textures.load_dir("assets", rl, thread);
+		textures.load_dir("assets/tiles", rl, thread);
 
 		Self {
 			levels: get_levels(),
@@ -60,7 +60,7 @@ impl Game {
 
 	fn run(&mut self, rl: &mut RaylibHandle, thread: &RaylibThread) {
 		while !rl.window_should_close() {
-			let mut d = rl.begin_drawing(&thread);
+			let mut d = rl.begin_drawing(thread);
 			if let Some(editor) = &mut self.open_editor {
 				editor.update(&d);
 				editor.draw(&mut d, &self.textures);
@@ -181,7 +181,7 @@ impl Game {
 
 				if simple_button(d, level_list_width + 10, solution_y, entry_width, 30) {
 					let n = solutions.len();
-					solutions.push(Solution::new(&level, n));
+					solutions.push(Solution::new(level, n));
 				}
 				d.draw_text(
 					"new solution",
@@ -224,8 +224,7 @@ fn get_levels() -> Vec<Level> {
 		let l = read_to_string(d.path())
 			.ok()
 			.as_deref()
-			.map(|s| serde_json::from_str(s).ok())
-			.flatten();
+			.and_then(|s| serde_json::from_str(s).ok());
 		if let Some(level) = l {
 			levels.push(level);
 		}
@@ -248,8 +247,7 @@ fn get_solutions() -> HashMap<String, Vec<Solution>> {
 						let s = read_to_string(file.path())
 							.ok()
 							.as_deref()
-							.map(|s| serde_json::from_str(s).ok())
-							.flatten();
+							.and_then(|s| serde_json::from_str(s).ok());
 						if let Some(solution) = s {
 							solutions.push(solution)
 						}
diff --git a/src/marble_engine/board.rs b/src/marble_engine/board.rs
index 884d905..90c0518 100644
--- a/src/marble_engine/board.rs
+++ b/src/marble_engine/board.rs
@@ -174,7 +174,7 @@ impl Board {
 	pub fn grow_to_include(&mut self, p: Pos) {
 		let p = self.transform(p);
 		if p.x < 0 {
-			let len = p.x.abs() as usize;
+			let len = p.x.unsigned_abs();
 			for row in &mut self.rows {
 				let mut new_row = vec![Tile::Blank; len];
 				new_row.append(row);
@@ -191,7 +191,7 @@ impl Board {
 		}
 
 		if p.y < 0 {
-			let len = p.y.abs() as usize;
+			let len = p.y.unsigned_abs();
 			let mut new_rows = vec![vec![Tile::Blank; self.width]; len];
 			new_rows.append(&mut self.rows);
 			self.rows = new_rows;
diff --git a/src/solution.rs b/src/solution.rs
index a25ebef..ac55307 100644
--- a/src/solution.rs
+++ b/src/solution.rs
@@ -38,7 +38,7 @@ impl Solution {
 	pub fn save(&self) {
 		let dir = userdata_dir().join("solutions").join(&self.level_id);
 		fs::create_dir_all(&dir).unwrap();
-		let path = dir.join(&format!("{}.json", &self.solution_id));
+		let path = dir.join(format!("{}.json", &self.solution_id));
 
 		let json = serde_json::to_string_pretty(self).unwrap();
 		let mut file = File::create(path).unwrap();
diff --git a/src/util.rs b/src/util.rs
index 5cd412a..f5a2d8f 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -110,7 +110,7 @@ pub fn text_input(
 	let drawn_text = if *is_selected {
 		&format!("{text}_")
 	} else {
-		&text
+		text.as_str()
 	};
 	d.draw_text(
 		drawn_text,