diff --git a/scenes/card.gd b/scenes/card.gd
index a09d231..8c97c5a 100644
--- a/scenes/card.gd
+++ b/scenes/card.gd
@@ -120,6 +120,7 @@ func set_id(new_id):
 	var texture = load(art_path)
 	if texture:
 		$Image.texture = texture
+	$Panel/Glow.visible = not id in game.state["played_cards"]
 	
 func move_back():
 	position = _home_position
@@ -155,6 +156,10 @@ func try_play(full_command):
 		get_parent().add_child(particles)
 		move_back()
 		game.energy -= energy
+		if not id in game.state["played_cards"]:
+			game.state["played_cards"].push_back(id)
+			game.save_state()
+			$Panel/Glow.hide()
 	else:
 		move_back()
 
diff --git a/scenes/card.tscn b/scenes/card.tscn
index 6f89db9..55c230f 100644
--- a/scenes/card.tscn
+++ b/scenes/card.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=11 format=2]
+[gd_scene load_steps=13 format=2]
 
 [ext_resource path="res://fonts/default.tres" type="DynamicFont" id=1]
 [ext_resource path="res://nodes/blob.svg" type="Texture" id=2]
@@ -19,10 +19,30 @@ shadow_color = Color( 0, 0, 0, 0.392157 )
 shadow_size = 4
 shadow_offset = Vector2( -2, 2 )
 
-[sub_resource type="RectangleShape2D" id=2]
+[sub_resource type="Shader" id=2]
+resource_local_to_scene = true
+code = "shader_type canvas_item;
+
+uniform float hovered;
+
+void fragment() {
+	vec2 center = vec2(0.5, 0.5);
+	float dx = abs(UV.x - center.x);
+	float dy = abs(UV.y - center.y);
+	float d = distance(UV, center);
+	COLOR = vec4(0.9, 0.5, 0.5, smoothstep(0.5,0.2 + hovered*0.1,d));
+}
+"
+
+[sub_resource type="ShaderMaterial" id=3]
+resource_local_to_scene = true
+shader = SubResource( 2 )
+shader_param/hovered = 0.0
+
+[sub_resource type="RectangleShape2D" id=4]
 extents = Vector2( 105.74, 143.46 )
 
-[sub_resource type="StyleBoxFlat" id=3]
+[sub_resource type="StyleBoxFlat" id=5]
 bg_color = Color( 1, 1, 1, 0.243137 )
 corner_radius_top_left = 10
 corner_radius_top_right = 10
@@ -45,6 +65,14 @@ __meta__ = {
 "_edit_use_anchors_": false
 }
 
+[node name="Glow" type="Sprite" parent="Panel"]
+modulate = Color( 1, 1, 1, 0.643137 )
+show_behind_parent = true
+material = SubResource( 3 )
+position = Vector2( 101.782, 146.207 )
+scale = Vector2( 5.03758, 6.05786 )
+texture = ExtResource( 2 )
+
 [node name="ColorRect" type="ColorRect" parent="."]
 visible = false
 margin_left = -103.0
@@ -62,7 +90,7 @@ position = Vector2( 0, -145.336 )
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="Area2D"]
 position = Vector2( -6.10352e-05, -0.641296 )
-shape = SubResource( 2 )
+shape = SubResource( 4 )
 
 [node name="Label" type="RichTextLabel" parent="."]
 margin_left = -91.0
@@ -82,7 +110,7 @@ margin_top = -101.0
 margin_right = 94.0
 margin_bottom = -10.0
 mouse_filter = 2
-custom_styles/panel = SubResource( 3 )
+custom_styles/panel = SubResource( 5 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
diff --git a/scenes/drop_area.tscn b/scenes/drop_area.tscn
index b297917..ed564e6 100644
--- a/scenes/drop_area.tscn
+++ b/scenes/drop_area.tscn
@@ -17,7 +17,6 @@ void fragment() {
 	COLOR = vec4(0.4 + hovered*0.2, 0.65 + hovered*0.2, 1, smoothstep(0.5,0.2 + hovered*0.1,d));
 }
 "
-custom_defines = ""
 
 [sub_resource type="ShaderMaterial" id=3]
 resource_local_to_scene = true
diff --git a/scenes/game.gd b/scenes/game.gd
index aec4040..370464a 100644
--- a/scenes/game.gd
+++ b/scenes/game.gd
@@ -45,7 +45,7 @@ func copy_script_to_game_env(name):
 	global_shell.run("chmod u+x '%s'" % (tmp_prefix + name))
 	
 func _initial_state():
-	return {"history": [], "solved_levels": [], "received_hints": [], "cli_badge": []}
+	return {"history": [], "solved_levels": [], "received_hints": [], "cli_badge": [], "played_cards": []}
 	
 func save_state():
 	var savegame = File.new()