diff --git a/.gitmodules b/.gitmodules
index 32be516..ec6a971 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "zig/3rd-party/raylib"]
 	path = zig/3rd-party/raylib
 	url = https://github.com/raysan5/raylib/
+[submodule "zig/3rd-party/raygui"]
+	path = zig/3rd-party/raygui
+	url = https://github.com/raysan5/raygui/
diff --git a/flake.nix b/flake.nix
index 0fe3a10..e70959f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,10 +37,15 @@
             };
           in mkShell {
             buildInputs = [
+              sqlite
+
+              # Dev tools
               just
-              flutter
               vscodeCustom
 
+              # Flutter
+              flutter
+
               # Linux toolchain
               clang_15
               cmake
@@ -52,8 +57,9 @@
 
               # Zig / webAssembly impl.
               zig
+              zls
             ];
-            
+
             # see: https://discourse.nixos.org/t/flutter-run-d-linux-build-process-failed/16552/2
             shellHook = ''
               export LD_LIBRARY_PATH=${libepoxy}/lib
diff --git a/zig/3rd-party/raygui b/zig/3rd-party/raygui
new file mode 160000
index 0000000..85a5c10
--- /dev/null
+++ b/zig/3rd-party/raygui
@@ -0,0 +1 @@
+Subproject commit 85a5c104f509b183c8cc7db0d90c2ab7a2b198c8
diff --git a/zig/build.zig b/zig/build.zig
index 047fe53..232cf3e 100644
--- a/zig/build.zig
+++ b/zig/build.zig
@@ -20,7 +20,9 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    exe.addIncludePath(.{ .path = "3rd-party/raygui/src" });
     exe.linkLibrary(raylib_dep.artifact("raylib"));
+    exe.linkSystemLibrary("sqlite3");
 
     // This declares intent for the executable to be installed into the
     // standard location when the user invokes the "install" step (the default
diff --git a/zig/src/main.zig b/zig/src/main.zig
index d9cff41..d7091b6 100644
--- a/zig/src/main.zig
+++ b/zig/src/main.zig
@@ -2,6 +2,13 @@ const std = @import("std");
 const raylib = @cImport({
     @cInclude("raylib.h");
 });
+const raygui = @cImport({
+    @cDefine("RAYGUI_IMPLEMENTATION", "1");
+    @cInclude("raygui.h");
+});
+const sqlite = @cImport({
+    @cInclude("sqlite3.h");
+});
 
 pub fn main() !void {
     const screen_width = 800;
@@ -14,6 +21,7 @@ pub fn main() !void {
 
         raylib.ClearBackground(raylib.RAYWHITE);
         raylib.DrawText("Congrats! You created your first window!", 190, 200, 20, raylib.LIGHTGRAY);
+        if (raygui.GuiButton(.{ .x = 0, .y = 0, .width = 100, .height = 100 }, "MyButton") == 1) {}
     }
     raylib.CloseWindow();
 }