diff --git a/README.md b/README.md
index 2f7fa49..df716cc 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,11 @@ logic mostly like https://git.crispypin.cc/CrispyPin/marble
 ```
 - assets/
 - levels/
-  - chapter_01.json
-  - chapter_02.json
+  - 01_intro/
+    - 01_output.json
+    - 02_cat.json
+  - 02_lists/
+    - 02_parse.json
   - sandbox.json
 - user/
   - solutions/
@@ -49,7 +52,46 @@ logic mostly like https://git.crispypin.cc/CrispyPin/marble
   - blueprints
     - blueprint_0.json
 ```
-
+## formats
+### level
+`00_zeroes.json`
+```json
+{
+  "id": "output",
+  "sortorder": 5,
+  "name": "Zeroes",
+  "description": "learn how to output data",
+  "init_board": "<optional, serialized board>",
+  "stages": [{
+    "input": [],
+    "output": [0, 0, 0, 0, 0, 0, 0, 0],
+  }]
+}
+```
+### solution
+`00_zeroes/solution_0.json`
+```json
+{
+  "level_id": "00_zeroes",
+  "solution_id": 0,
+  "name": "unnamed 1",
+  "board": "oo\nP*\n|-",
+  "score": {
+    "cycles": 8,
+    "tiles": 6,
+    "area": 6,
+  }
+}
+```
+### blueprint
+`blueprints/blueprint_0.json`
+```json
+{
+  "id": 0,
+  "name": "zero_printer",
+  "board": "o -B I\n> * < \n"
+}
+```
 
 ## levels
 ### intro, basic mechanics
diff --git a/assets/exit.png b/assets/exit.png
deleted file mode 100644
index 2dca7a5..0000000
Binary files a/assets/exit.png and /dev/null differ
diff --git a/src/editor.rs b/src/editor.rs
index 7f116ff..bacdfa3 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -675,27 +675,23 @@ impl Editor {
 		);
 
 		if self.exit_menu {
-			if simple_button(d, 4, 4, 32, 32) {
-				self.exit_state = ExitState::ExitAndSave;
-			}
-			self.tooltip.add(4, 4, 32, 32, "exit");
-			draw_scaled_texture(d, textures.get("exit"), 4, 4, 2.);
-			if simple_button(d, 38, 4, 32, 32) {
+			if simple_button(d, 5, 5, 75, 30) {
 				self.exit_menu = false;
 			}
-			draw_scaled_texture(d, textures.get("cancel"), 38, 4, 2.);
-			self.tooltip.add(38, 4, 32, 32, "cancel");
+			d.draw_text("cancel", 10, 10, 20, Color::WHITE);
+			if simple_button(d, 85, 5, 60, 30) {
+				self.exit_state = ExitState::ExitAndSave;
+			}
+			d.draw_text("exit", 90, 10, 20, Color::WHITE);
 		} else {
-			if simple_button(d, 4, 4, 32, 32) {
+			if simple_button(d, 5, 5, 75, 30) {
 				self.exit_menu = true;
 			}
-			self.tooltip.add(4, 4, 32, 32, "exit");
-			draw_scaled_texture(d, textures.get("exit"), 4, 4, 2.);
-			if simple_button(d, 38, 4, 32, 32) {
+			d.draw_text("exit", 10, 10, 20, Color::WHITE);
+			if simple_button(d, 85, 5, 60, 30) {
 				self.exit_state = ExitState::Save;
 			}
-			draw_scaled_texture(d, textures.get("save"), 38, 4, 2.);
-			self.tooltip.add(38, 4, 32, 32, "save");
+			d.draw_text("save", 90, 10, 20, Color::WHITE);
 		}
 
 		if self.sim_state == SimState::Editing {
diff --git a/src/main.rs b/src/main.rs
index 760c56d..a999f71 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -40,7 +40,7 @@ struct Game {
 #[derive(Debug)]
 enum LevelListEntry {
 	Level(Level),
-	Chapter(String, usize),
+	ChapterTitle(String),
 }
 
 fn main() {
@@ -128,46 +128,43 @@ impl Game {
 		let mouse_pos = d.get_mouse_position();
 		let scroll_delta = d.get_mouse_wheel_move();
 
-		const ENTRY_SPACING: i32 = 65;
-		let fit_on_screen = (d.get_screen_height() / ENTRY_SPACING) as usize;
-		let max_scroll = self.levels.len().saturating_sub(fit_on_screen);
 		if mouse_pos.x < level_list_width as f32 {
-			if scroll_delta < 0. && self.level_scroll < max_scroll {
+			if scroll_delta < 0. && self.level_scroll < self.levels.len().saturating_sub(5) {
 				self.level_scroll += 1;
-			}
-			if scroll_delta > 0. && self.level_scroll > 0 {
+			} else if scroll_delta > 0. && self.level_scroll > 0 {
 				self.level_scroll -= 1;
 			}
 		}
 
-		for (row_index, level_index) in (self.level_scroll..self.levels.len()).enumerate() {
-			let level = &mut self.levels[level_index];
-			let y = 10 + row_index as i32 * ENTRY_SPACING;
+		for (i, level) in self.levels[self.level_scroll..].iter().enumerate() {
+			let level_entry_height = 65;
+			let index = i + self.level_scroll;
+			let y = 10 + i as i32 * level_entry_height;
 			let bounds = Rectangle {
 				x: 5.,
 				y: y as f32 - 5.,
 				width: level_list_width as f32 - 10.,
-				height: ENTRY_SPACING as f32 - 5.,
+				height: level_entry_height as f32 - 5.,
 			};
-			let clicked_this = clicked && bounds.check_collision_point_rec(mouse_pos);
 			match level {
-				LevelListEntry::Chapter(title, level_count) => {
+				LevelListEntry::ChapterTitle(title) => {
 					d.draw_rectangle_rec(bounds, BG_DARK);
 					d.draw_text(title, 10, y, 30, FG_CHAPTER_TITLE);
-					let subtitle = format!("{level_count} levels");
-					d.draw_text(&subtitle, 10, y + 30, 20, Color::WHITE);
 				}
 				LevelListEntry::Level(level) => {
-					if clicked_this && self.selected_level != level_index {
+					if clicked
+						&& bounds.check_collision_point_rec(mouse_pos)
+						&& self.selected_level != index
+					{
 						self.editing_solution_name = false;
-						self.selected_level = level_index;
+						self.selected_level = index;
 						self.selected_solution = 0;
 						// select the last solution of the level, if there is one
 						if let Some(solutions) = self.solutions.get(level.id()) {
 							self.selected_solution = solutions.len().saturating_sub(1);
 						}
 					}
-					d.draw_rectangle_rec(bounds, widget_bg(self.selected_level == level_index));
+					d.draw_rectangle_rec(bounds, widget_bg(self.selected_level == index));
 
 					let mut title_color = Color::WHITE;
 					if let Some(solutions) = self.solutions.get(level.id()) {
@@ -316,7 +313,7 @@ fn get_levels() -> Vec<LevelListEntry> {
 
 	let mut levels = Vec::new();
 	for c in chapters {
-		levels.push(LevelListEntry::Chapter(c.title, c.levels.len()));
+		levels.push(LevelListEntry::ChapterTitle(c.title));
 		levels.extend(c.levels.into_iter().map(LevelListEntry::Level));
 	}
 	levels