diff --git a/.gitmodules b/.gitmodules
index 41ef811..cac25ab 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "libs/raylib/raylib"]
 	path = libs/raylib/raylib
 	url = git@github.com:raysan5/raylib.git
+[submodule "libs/raygui"]
+	path = libs/raygui
+	url = git@github.com:ryupold/raygui.zig.git
diff --git a/build.zig b/build.zig
index 3fa86d6..13d98b9 100644
--- a/build.zig
+++ b/build.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const raylib = @import("libs/raylib/build.zig");
+const raygui = @import("libs/raygui/build.zig");
 
 pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
@@ -33,7 +34,8 @@ pub fn build(b: *std.Build) !void {
         exe.addOptions("options", options);
     }
 
-    raylib.addTo(b, exe, target, optimize, .{});
+    raylib.addTo(b, exe, target, optimize, .{ });
+    raygui.addTo(b, exe, target, optimize);
 
     const run_cmd = b.addRunArtifact(exe);
 
diff --git a/libs/raygui b/libs/raygui
new file mode 160000
index 0000000..1f5aac4
--- /dev/null
+++ b/libs/raygui
@@ -0,0 +1 @@
+Subproject commit 1f5aac4949ca485f548e623652ffda0080470179
diff --git a/src/main-scene.zig b/src/main-scene.zig
index aa6c459..e4d8442 100644
--- a/src/main-scene.zig
+++ b/src/main-scene.zig
@@ -1,7 +1,9 @@
 const Self = @This();
 const rl = @import("raylib");
+const gui = @import("raygui");
 const std = @import("std");
-const ROM = @import("./roms.zig").ROM;
+const roms = @import("./roms.zig");
+const ROM = roms.ROM;
 
 const ChipContext = @import("chip.zig");
 const RaylibChip = @import("raylib-chip.zig");
@@ -10,6 +12,8 @@ const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
 const StringList = std.ArrayList([]const u8);
 
+const example_roms = roms.listROMs();
+
 allocator: Allocator,
 
 chip: *ChipContext,
@@ -17,6 +21,8 @@ raylib_chip: *RaylibChip,
 chip_sound: rl.Sound,
 rom: ?ROM = null,
 
+is_gui_open: bool = true,
+
 pub fn genSinWave(wave: *rl.Wave, frequency: f32) void {
     assert(wave.sampleSize == 16); // Only 16 bits are supported
 
@@ -54,13 +60,17 @@ pub fn init(allocator: Allocator) !Self {
     var raylib_chip = try allocator.create(RaylibChip);
     raylib_chip.* = RaylibChip.init(chip, chip_sound);
 
-    return Self {
+    var self = Self {
         .allocator = allocator,
 
         .chip = chip,
         .raylib_chip = raylib_chip,
         .chip_sound = chip_sound,
     };
+
+    self.set_rom(example_roms[3]);
+
+    return self;
 }
 
 pub fn deinit(self: *Self) void {
@@ -78,7 +88,9 @@ pub fn set_rom(self: *Self, rom: ROM) void {
 }
 
 pub fn update(self: *Self, dt: f32) void {
-    self.raylib_chip.update(dt);
+    if (!self.is_gui_open) {
+        self.raylib_chip.update(dt);
+    }
 }
 
 pub fn draw(self: *Self) void {
@@ -102,4 +114,35 @@ pub fn draw(self: *Self) void {
         render_width,
         render_height
     );
+
+    self.draw_gui();
+}
+
+pub fn draw_gui(self: *Self) void {
+    if (rl.IsKeyPressed(.KEY_TAB)) {
+        self.is_gui_open = !self.is_gui_open;
+    }
+
+    if (!self.is_gui_open) return;
+
+    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
+    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
+    rl.DrawRectangle(0, 0, rl.GetScreenWidth(), rl.GetScreenHeight(), .{
+        .r = 22,
+        .g = 22,
+        .b = 22,
+        .a = 128,
+    });
+
+    const window_width: f32 = 300;
+    const window_height: f32 = 100;
+    const window = rl.Rectangle{
+        .x = (screen_width-window_width)/2,
+        .y = (screen_height-window_height)/2,
+        .width = window_width,
+        .height = window_height
+    };
+    if (gui.GuiWindowBox(window, "CHIP-8 Settings") == 1) {
+        self.is_gui_open = false;
+    }
 }
diff --git a/src/main.zig b/src/main.zig
index c859fba..82c49de 100755
--- a/src/main.zig
+++ b/src/main.zig
@@ -31,9 +31,6 @@ pub fn main() anyerror!void {
     var scene = try MainScene.init(allocator);
     defer scene.deinit();
 
-    const roms = comptime listROMs();
-    scene.set_rom(roms[3]);
-
     const font_size = 24;
     const font_ttf_default_numchars = 95; // TTF font generation default charset: 95 glyphs (ASCII 32..126)
     const font = rl.LoadFontEx("src/assets/fonts/generic-mono.otf", font_size, null, font_ttf_default_numchars);