diff --git a/scripts/game.js b/scripts/game.js
index d2dde29..ca3eba6 100644
--- a/scripts/game.js
+++ b/scripts/game.js
@@ -66,7 +66,7 @@ function gamechk()
     // temporary
     if ( ele_game.className.search( 'opening' ) > -1 ) return;
 
-    lasertank.ClassicGame( ltg_data, lvl_data )
+    lasertank.ClassicGame( document, ltg_data, lvl_data )
         .on( 'ready', function()
         {
             this.renderTo( ctx, window );
diff --git a/src/ClassicGame.js b/src/ClassicGame.js
index 6324e4b..ac6adb6 100644
--- a/src/ClassicGame.js
+++ b/src/ClassicGame.js
@@ -88,15 +88,20 @@ module.exports = Class( 'ClassicGame' )
      * the constructor because they are needed in order for the game to be
      * functional.
      *
+     * DOCUMENT is used internally for creating elements; the DOM will not
+     * be manipulated.
+     *
+     * @param  {HTMLDocument}  document  DOM document
+     *
      * @param  {string}  ltg_data  binary string containing LTG file data
      * @param  {string}  lvl_data  binary string containing LVL file data
      */
-    __construct: function( ltg_data, lvl_data )
+    __construct: function( document, ltg_data, lvl_data )
     {
         const _self = this;
 
         this._ltgLoader = LtgLoader();
-        this._masker    = TileMasker( ClassicTileDfn() );
+        this._masker    = TileMasker( ClassicTileDfn(), document );
 
         this._gameObjFactory = ClassicGameObjectFactory();
 
diff --git a/src/TileMasker.js b/src/TileMasker.js
index 8f76c8f..4bd93d3 100644
--- a/src/TileMasker.js
+++ b/src/TileMasker.js
@@ -121,9 +121,13 @@ module.exports = Class( 'TileMasker',
      * allows us to support *any* type of tile set -- not just those that are
      * defined by the original game.
      *
-     * @param  {TileDfn}  tile_dfn  tile definition object
+     * DOCUMENT is used internally for creating elements; the DOM will not
+     * be manipulated.
+     *
+     * @param  {TileDfn}       tile_dfn  tile definition object
+     * @param  {HTMLDocument}  document  DOM document
      */
-    __construct: function( tile_dfn )
+    __construct: function( tile_dfn, document )
     {
         if ( !( Class.isA( TileDfn, tile_dfn ) ) )
         {
diff --git a/test/ltgloader-demo.html b/test/ltgloader-demo.html
index e16b965..0808e71 100644
--- a/test/ltgloader-demo.html
+++ b/test/ltgloader-demo.html
@@ -104,8 +104,11 @@
         reader.onload = function( event )
         {
           var loader = lasertank.LtgLoader(),
-              masker = lasertank.TileMasker( lasertank.ClassicTileDfn() ),
               meta   = loader.fromString( event.target.result ),
+              masker = lasertank.TileMasker(
+                  lasertank.ClassicTileDfn(),
+                  document
+              ),
 
               bmp_game = document.getElementById( 'bmp_game' ),
               bmp_mask = document.getElementById( 'bmp_mas' );