Mode -> Ruleset.

osu.Game.Rulesets.Osu/Objects/Drawables/Pieces/NumberPiece.cs

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+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics.Sprites;
+using OpenTK.Graphics;
+
+namespace osu.Game.Rulesets.Osu.Objects.Drawables.Pieces
+{
+    public class NumberPiece : Container
+    {
+        private readonly SpriteText number;
+
+        public string Text
+        {
+            get { return number.Text; }
+            set { number.Text = value; }
+        }
+
+        public NumberPiece()
+        {
+            Anchor = Anchor.Centre;
+            Origin = Anchor.Centre;
+
+            Children = new Drawable[]
+            {
+                new CircularContainer
+                {
+                    Masking = true,
+                    Origin = Anchor.Centre,
+                    EdgeEffect = new EdgeEffect
+                    {
+                        Type = EdgeEffectType.Glow,
+                        Radius = 60,
+                        Colour = Color4.White.Opacity(0.5f),
+                    },
+                    Children = new[]
+                    {
+                        new Box()
+                    }
+                },
+                number = new OsuSpriteText
+                {
+                    Text = @"1",
+                    Font = @"Venera",
+                    UseFullGlyphHeight = false,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    TextSize = 40,
+                    Alpha = 1
+                }
+            };
+        }
+    }
+}