diff --git a/src/blocks/scratch3_pen.js b/src/blocks/scratch3_pen.js
index d50bbe75..7de5e51a 100644
--- a/src/blocks/scratch3_pen.js
+++ b/src/blocks/scratch3_pen.js
@@ -328,7 +328,8 @@ class Scratch3PenBlocks {
                             type: ArgumentType.NUMBER,
                             defaultValue: 1
                         }
-                    }
+                    },
+                    hideFromPalette: true
                 },
                 {
                     opcode: 'changePenShadeBy',
@@ -339,7 +340,8 @@ class Scratch3PenBlocks {
                             type: ArgumentType.NUMBER,
                             defaultValue: 1
                         }
-                    }
+                    },
+                    hideFromPalette: true
                 },
                 {
                     opcode: 'setPenHueToNumber',
@@ -350,7 +352,8 @@ class Scratch3PenBlocks {
                             type: ArgumentType.NUMBER,
                             defaultValue: 1
                         }
-                    }
+                    },
+                    hideFromPalette: true
                 },
                 {
                     opcode: 'changePenHueBy',
@@ -361,7 +364,8 @@ class Scratch3PenBlocks {
                             type: ArgumentType.NUMBER,
                             defaultValue: 1
                         }
-                    }
+                    },
+                    hideFromPalette: true
                 }
             ],
             menus: {
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 1e0e90ca..b9738713 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -630,8 +630,9 @@ class Runtime extends EventEmitter {
         const xmlParts = [];
         for (const categoryInfo of this._blockInfo) {
             const {name, color1, color2} = categoryInfo;
+            const paletteBlocks = categoryInfo.blocks.filter(block => !block.info.hideFromPalette);
             xmlParts.push(`<category name="${name}" colour="${color1}" secondaryColour="${color2}">`);
-            xmlParts.push.apply(xmlParts, categoryInfo.blocks.map(blockInfo => blockInfo.xml));
+            xmlParts.push.apply(xmlParts, paletteBlocks.map(block => block.xml));
             xmlParts.push('</category>');
         }
         return xmlParts.join('\n');
diff --git a/src/extension-support/extension-manager.js b/src/extension-support/extension-manager.js
index d7c5fab0..2179e3f2 100644
--- a/src/extension-support/extension-manager.js
+++ b/src/extension-support/extension-manager.js
@@ -30,6 +30,7 @@ const builtinExtensions = {
  * @property {object.<string,ArgumentInfo>|undefined} arguments - information about this block's arguments, if any
  * @property {string|Function|undefined} func - the method for this block on the extension service (default: opcode)
  * @property {Array.<string>|undefined} filter - the list of targets for which this block should appear (default: all)
+ * @property {Boolean|undefined} hideFromPalette - true if should not be appear in the palette. (default false)
  */
 
 /**