diff --git a/sk_demo/src/Mono.cs b/sk_demo/src/Mono.cs
index f898902..fc794e4 100644
--- a/sk_demo/src/Mono.cs
+++ b/sk_demo/src/Mono.cs
@@ -228,18 +228,8 @@ public class Mono {
 
     mat.Run(); // run here or at the end?... or maybe both?
 
-    if (Input.Key(Key.Left).IsJustActive()) {
-      monoNet.value = 1;
-      monoNet.send = true;
-    }
-
-    if (Input.Key(Key.Right).IsJustActive()) {
-      monoNet.value = 2;
-      monoNet.send = true;
-    }
-
     if (Input.Key(Key.Down).IsJustActive()) {
-      monoNet.value = -1;
+      monoNet.value = 0;
       monoNet.send = true;
     }
 
@@ -250,7 +240,7 @@ public class Mono {
     Vec3 thumb_tip = palm_ori.Inverse * rig.hand_1.Get(FingerId.Thumb, JointId.Tip).position;
     Vec3 thumb_minor = palm_ori.Inverse * rig.hand_1.Get(FingerId.Thumb, JointId.KnuckleMinor).position;
     if (thumb_tip.x < thumb_minor.x - 0f * U.cm) {
-      Log.Info("thumb is out");
+      // Log.Info("thumb is out");
       xi = 0;
     }
 
@@ -291,6 +281,61 @@ public class Mono {
       }
     }
 
+    // keyboard
+    Matrix keyboard_m4 = Matrix.TRS(
+      rig.head_pos + V.XYZ(0, -0.1f, -0.2f),
+      rig.head_ori * Quat.FromAngles(0, 180, 0),
+      0.2f
+    );
+    Hierarchy.Push(keyboard_m4);
+    // 3 rows of 10 keys
+    for (int i = 0; i < 3; i++) {
+      for (int j = 0; j < 10; j++) {
+        // background quad
+        Mesh.Quad.Draw(
+          mat.unlit_clear,
+          Matrix.TRS(
+            V.XYZ(j * -0.1f, i * -0.1f, 0.0f) + V.XYZ(0.45f, 0.0f, 0.0f),
+            Quat.FromAngles(0, 0, 0),
+            0.09f
+          ),
+          Color.Hex(0x00000020)
+        );
+
+        int index = i * 10 + j;
+        // string text = characters[index].character;
+        string keychar = KeyToChar(index);
+
+        Text.Add(
+          keychar,
+          Matrix.TS(
+            V.XYZ(j * -0.1f, i * -0.1f, 0.0f) + V.XYZ(0.45f, 0.0f, 0.0f),
+            1.0f
+          ),
+          TextAlign.Center,
+          TextAlign.Center,
+          0, 0, 0
+        );
+        // show the braille dots(spheres) above the text
+        for (int k = 0; k < 6; k++) {
+          float spacing = 0.02f;
+          float x_offset = (k % 2) * spacing;
+          float y_offset = (k / 2) * -spacing;
+          if (char_cell[keychar][k] == 1) {
+            Mesh.Sphere.Draw(
+              mat.unlit_clear,
+              Matrix.TS(
+                V.XYZ(j * -0.1f - x_offset, i * -0.1f + y_offset, 0.0f) + V.XYZ(0.45f + 0.01f, 0.018f, 0.0f),
+                0.01f
+              ),
+              Color.Hex(0x80808040)
+            );
+          }
+        }
+      }
+    }
+    Hierarchy.Pop();
+
     // WORLD
     mesh_room.Draw(
       mat_room,