diff --git a/README.md b/README.md
index b7cfe0d..4485643 100644
--- a/README.md
+++ b/README.md
@@ -43,8 +43,8 @@ placing clue numbers, so every puzzle has a solution by construction.
    - Scroll wheel
    - and/or a ui button for zoom in/out
 - [x] Remove red color from rectangle option
-- [ ] Allow user to show the "seed" of the puzzle
-- [ ] Option to input a custom seed
+- [x] Allow user to show the "seed" of the puzzle
+- [x] Option to input a custom seed
 
 ### Possible Features
 - Keep local "high score" for each puzzle type
diff --git a/shikaku.py b/shikaku.py
index 25e0cf9..36d6aec 100644
--- a/shikaku.py
+++ b/shikaku.py
@@ -527,6 +527,7 @@ class ShikakuGame:
         self.new_puzzle()
 
     def new_puzzle(self, seed=None):
+        self.current_seed = seed or random.randint(0, 2**31)
         self.clues, self.solution = generate_puzzle(self.size, seed or random.randint(0, 2**31))
         self.player_rects = []
         self.start_time = time.time()
@@ -678,6 +679,10 @@ class ShikakuWindow(Gtk.ApplicationWindow):
         clear_btn.connect("clicked", self._on_clear)
         botbar.append(clear_btn)
 
+        seed_btn = Gtk.Button(label="Seed")
+        seed_btn.add_css_class("action-btn-ghost")
+        seed_btn.connect("clicked", self._on_seed)
+        botbar.append(seed_btn)
 
         self._status_label = Gtk.Label(label="Draw rectangles around each number — right-click to erase")
         self._status_label.add_css_class("status-label")
@@ -776,6 +781,24 @@ class ShikakuWindow(Gtk.ApplicationWindow):
         .status-err {
             color: #c06060;
         }
+        .seed-heading {
+            font-family: "Iosevka", "Monospace";
+            font-size: 10px;
+            letter-spacing: 3px;
+            color: #6a6070;
+        }
+        .seed-value {
+            font-family: "Iosevka", "Monospace";
+            font-size: 20px;
+            font-weight: 700;
+            color: #c0b8d8;
+            letter-spacing: 2px;
+        }
+        .seed-entry {
+            font-family: "Iosevka", "Monospace";
+            font-size: 14px;
+            color: #e8e0ff;
+        }
         """
 
     def _update_size_buttons(self):
@@ -879,6 +902,84 @@ class ShikakuWindow(Gtk.ApplicationWindow):
     def _on_zoom_reset(self, btn):
         self.canvas.set_zoom(1.0)
 
+    def _on_seed(self, btn):
+        dialog = Gtk.Dialog(title="Puzzle Seed", transient_for=self, modal=True)
+        dialog.set_resizable(False)
+
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=12)
+        box.set_margin_top(20)
+        box.set_margin_bottom(20)
+        box.set_margin_start(24)
+        box.set_margin_end(24)
+        dialog.get_content_area().append(box)
+
+        # Current seed display
+        current_label = Gtk.Label(label="CURRENT SEED")
+        current_label.add_css_class("seed-heading")
+        current_label.set_halign(Gtk.Align.START)
+        box.append(current_label)
+
+        seed_val = Gtk.Label(label=str(self.game.current_seed))
+        seed_val.add_css_class("seed-value")
+        seed_val.set_selectable(True)
+        seed_val.set_halign(Gtk.Align.START)
+        box.append(seed_val)
+
+        sep = Gtk.Separator()
+        sep.set_margin_top(4)
+        sep.set_margin_bottom(4)
+        box.append(sep)
+
+        # Custom seed entry
+        entry_label = Gtk.Label(label="ENTER SEED")
+        entry_label.add_css_class("seed-heading")
+        entry_label.set_halign(Gtk.Align.START)
+        box.append(entry_label)
+
+        entry = Gtk.Entry()
+        entry.set_placeholder_text("e.g. 123456789")
+        entry.set_input_purpose(Gtk.InputPurpose.DIGITS)
+        entry.add_css_class("seed-entry")
+        box.append(entry)
+
+        # Buttons
+        btn_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+        btn_box.set_halign(Gtk.Align.END)
+        btn_box.set_margin_top(8)
+        box.append(btn_box)
+
+        cancel_btn = Gtk.Button(label="Cancel")
+        cancel_btn.add_css_class("action-btn-ghost")
+        cancel_btn.connect("clicked", lambda b: dialog.close())
+        btn_box.append(cancel_btn)
+
+        go_btn = Gtk.Button(label="Start Puzzle")
+        go_btn.add_css_class("action-btn")
+        btn_box.append(go_btn)
+
+        def _on_go(b):
+            text = entry.get_text().strip()
+            try:
+                seed = int(text)
+            except ValueError:
+                entry.add_css_class("error")
+                return
+            dialog.close()
+            self.game.new_puzzle(seed=seed)
+            self.canvas._error_rects = set()
+            self.canvas.zoom = 1.0
+            self._zoom_label.set_text("100%")
+            self._update_canvas_size()
+            self._status_label.remove_css_class("status-ok")
+            self._status_label.remove_css_class("status-err")
+            self._status_label.set_text("Draw rectangles around each number — right-click to erase")
+            self.canvas.queue_draw()
+
+        go_btn.connect("clicked", _on_go)
+        entry.connect("activate", _on_go)  # Enter key submits
+
+        dialog.present()
+
 
 # ─── Application entry ────────────────────────────────────────────────────────