diff --git a/src/main.zig b/src/main.zig
index 38edaf9..ced4376 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -143,13 +143,11 @@ pub fn main() !void {
         if (conf.mouse_enabled) {
             // Update position.
             {
-                // Set mouse offset.
-                ray.SetMouseOffset(camera.x, camera.y);
                 // Set mouse scaling.
                 ray.SetMouseScale(1.0 / @intToFloat(f32, scale), 1.0 / @intToFloat(f32, scale));
 
-                mouse.pos.x = @intCast(u16, ray.GetMouseX());
-                mouse.pos.y = @intCast(u16, ray.GetMouseY());
+                mouse.pos.x = @intCast(u16, ray.GetMouseX() + camera.x);
+                mouse.pos.y = @intCast(u16, ray.GetMouseY() + camera.y);
             }
 
             const left_click: bool = ray.IsMouseButtonPressed(conf.mouse_left_btn);
@@ -193,8 +191,7 @@ pub fn main() !void {
                     cursor = mouse.pos;
                     level.select_cell(mouse.pos, true);
                 },
-                // Rectangle selection, see `left_release` for handling.
-                .rect_sel => {},
+                else => {},
             }
         }
 
@@ -204,6 +201,7 @@ pub fn main() !void {
         ray.ClearBackground(ray.BLACK);
         level.draw(scale, camera);
         level.draw_selection(scale, camera);
+        mouse.draw(scale, camera);
         //ray.DrawFPS(0, 0);
     }
 }
diff --git a/src/mouse.zig b/src/mouse.zig
index 4080172..4a82549 100644
--- a/src/mouse.zig
+++ b/src/mouse.zig
@@ -4,12 +4,19 @@
 // MIT licensed. The MIT license requires this copyright notice to be
 // included in all copies and substantial portions of the software.
 //! Mouse (eurk) logic and operations.
+const ray = @cImport({
+    @cInclude("raylib.h");
+});
 const std = @import("std");
 
 const Vec2 = @import("vec2.zig");
+const Rect = @import("rect.zig");
+const scaling = @import("scaling.zig");
 
 const Self = @This();
 
+const preview_color = ray.SKYBLUE;
+
 pub const MouseMode = enum {
     wait, // Skip one turn.
     idle,
@@ -21,6 +28,7 @@ mode: MouseMode, // State.
 pos: Vec2, // Where the cursor is.
 start_pos: Vec2, // Used for rectangle selection.
 
+/// Create structure with correct default values.
 pub fn init() Self {
     return Self{
         .mode = MouseMode.idle, // state
@@ -28,3 +36,23 @@ pub fn init() Self {
         .start_pos = Vec2{ .x = 0, .y = 0 },
     };
 }
+
+/// Draw cursor or preview rectangle selection depending on mode.
+pub fn draw(self: *Self, scale: scaling.scale_type, offset: Vec2) void {
+    switch (self.mode) {
+        MouseMode.sel => {
+            const x = (self.pos.x - offset.y) * scale;
+            const y = (self.pos.y - offset.y) * scale;
+            ray.DrawRectangleLines(x, y, scale, scale, preview_color);
+        },
+        MouseMode.rect_sel => {
+            const rect = Rect.init_from_vec2(self.pos, self.start_pos);
+            const x = (rect.left_x - offset.x) * scale;
+            const w = (rect.right_x - rect.left_x + 1) * scale;
+            const y = (rect.top_y - offset.y) * scale;
+            const h = (rect.bottom_y - rect.top_y + 1) * scale;
+            ray.DrawRectangleLines(x, y, w, h, preview_color);
+        },
+        else => {},
+    }
+}