diff --git a/assets/tiles/io_tile_off.png b/assets/tiles/io_tile_off.png
index 88872bd..afe0ffd 100644
Binary files a/assets/tiles/io_tile_off.png and b/assets/tiles/io_tile_off.png differ
diff --git a/assets/tiles/io_tile_on.png b/assets/tiles/io_tile_on.png
index 0ad849b..b543a9f 100644
Binary files a/assets/tiles/io_tile_on.png and b/assets/tiles/io_tile_on.png differ
diff --git a/src/editor.rs b/src/editor.rs
index 8fbbd59..e1877b3 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -444,20 +444,23 @@ impl Editor {
 	}
 
 	pub fn draw(&mut self, d: &mut RaylibDrawHandle, textures: &Textures) {
-		d.clear_background(BG_WORLD);
+		d.clear_background(gray(48));
 
-		if self.draw_overlay && self.zoom >= 0.5 {
-			let tile_size = TILE_TEXTURE_SIZE * self.zoom;
+		if self.draw_overlay && self.zoom >= 1. {
+			let tile_size = (TILE_TEXTURE_SIZE * self.zoom) as f32;
 			let grid_spill_x = (self.view_offset.x).rem(tile_size) - tile_size;
 			let grid_spill_y = (self.view_offset.y).rem(tile_size) - tile_size;
-			for y in 0..=(d.get_screen_height() / tile_size as i32) {
-				let y = y * tile_size as i32 + grid_spill_y as i32;
-				d.draw_line(0, y, d.get_screen_width(), y, FG_GRID);
-			}
-			for x in 0..=(d.get_screen_width() / tile_size as i32) {
-				let x = x * tile_size as i32 + grid_spill_x as i32;
-				d.draw_line(x, 0, x, d.get_screen_height(), FG_GRID);
-			}
+			d.gui_grid(
+				Rectangle::new(
+					grid_spill_x,
+					grid_spill_y,
+					d.get_screen_width() as f32 * 2.,
+					d.get_screen_height() as f32 * 2.,
+				),
+				None,
+				tile_size,
+				1,
+			);
 		}
 
 		self.draw_board(d, textures);
diff --git a/src/marble_engine.rs b/src/marble_engine.rs
index 422301e..f99ddd2 100644
--- a/src/marble_engine.rs
+++ b/src/marble_engine.rs
@@ -179,6 +179,25 @@ impl Machine {
 			};
 		}
 
+		for &(pos, _val, _dir) in &new_marbles {
+			let Some(Tile::Open(OpenTile::Blank, claim)) = self.board.get_mut(pos) else {
+				unreachable!()
+			};
+			*claim = match claim {
+				Claim::Free => Claim::Claimed,
+				Claim::Claimed | Claim::Blocked => Claim::Blocked,
+				_ => unreachable!(),
+			}
+		}
+		// new marbles are past old_marbles index, so will not move this step
+		for (pos, value, dir) in new_marbles {
+			let Some(Tile::Open(OpenTile::Blank, Claim::Claimed)) = self.board.get_mut(pos) else {
+				continue;
+			};
+			self.board.set(pos, Tile::Marble { value, dir });
+			self.marbles.push(pos);
+		}
+
 		// old wires have to be reset after machine processing,
 		// so they can figure out which directions they are powered from
 		for &p in &self.powered {
@@ -201,7 +220,7 @@ impl Machine {
 			Multiple,
 		}
 
-		// #### find all direct bounces ####
+		// find all direct bounces
 		let mut will_reverse_direction = vec![false; self.marbles.len()];
 		// todo store in tile to remove search through self.marbles
 		let mut influenced_direction = vec![DirInfluence::None; self.marbles.len()];
@@ -242,7 +261,7 @@ impl Machine {
 				_ => (),
 			}
 		}
-		// #### apply all direct bounces ####
+		// apply all direct bounces
 		for (i, &pos) in self.marbles.iter().enumerate() {
 			let Some(Tile::Marble { value: _, dir }) = self.board.get_mut(pos) else {
 				unreachable!()
@@ -254,29 +273,6 @@ impl Machine {
 			}
 		}
 
-		// #### new marbles ####
-		// prepare creating the new marbles
-		for &(pos, _val, _dir) in &new_marbles {
-			let Some(Tile::Open(OpenTile::Blank, claim)) = self.board.get_mut(pos) else {
-				unreachable!()
-			};
-			*claim = match claim {
-				Claim::Free => Claim::Claimed,
-				Claim::Claimed | Claim::Blocked => Claim::Blocked,
-				_ => unreachable!(),
-			}
-		}
-		// create new marbles
-		// new marbles are past old_marbles index, so will not move this step
-		for (pos, value, dir) in new_marbles {
-			let Some(Tile::Open(OpenTile::Blank, Claim::Claimed)) = self.board.get_mut(pos) else {
-				continue;
-			};
-			self.board.set(pos, Tile::Marble { value, dir });
-			self.marbles.push(pos);
-		}
-
-		// #### movement ####
 		let mut claim_positions = Vec::new();
 		// mark claims to figure out what spaces can be moved to
 		for &pos in &self.marbles[..old_marbles] {
diff --git a/src/theme.rs b/src/theme.rs
index fd2875c..6d9cdc8 100644
--- a/src/theme.rs
+++ b/src/theme.rs
@@ -1,8 +1,5 @@
 use raylib::prelude::*;
 
-pub const BG_WORLD: Color = gray(48);
-pub const FG_GRID: Color = gray(64);
-
 pub const BG_DARK: Color = gray(32);
 pub const BG_MEDIUM: Color = gray(48);
 pub const BG_LIGHT: Color = gray(64);