diff --git a/ueforth/common/grf_test.fs b/ueforth/common/grf_test.fs
index d795ebf..e517c2f 100755
--- a/ueforth/common/grf_test.fs
+++ b/ueforth/common/grf_test.fs
@@ -30,8 +30,8 @@ grf
       ." CHAR: " last-char . cr
     then
 )
-    0 color! 0 0 width height box
-    LEFT-BUTTON pressed? if $ccccff else $ffccff then color!
+    0 to color 0 0 width height box
+    LEFT-BUTTON pressed? if $ccccff else $ffccff then to color
     mouse-x mouse-y height heart
     flip
   event FINISHED = until
diff --git a/ueforth/common/grf_utils.fs b/ueforth/common/grf_utils.fs
index a80487f..0ab8a55 100644
--- a/ueforth/common/grf_utils.fs
+++ b/ueforth/common/grf_utils.fs
@@ -14,35 +14,33 @@
 
 ( Graphics Utilities )
 \ Pen:
-\   color! ( col -- )
+\   ( $rrggbb ) to color
 \ Drawing:
 \   box ( x y w h -- )
 
 also internals
 grf definitions
+
+0 value color
+
 internals definitions
 
-variable color
-
 ( Scale to be divided by $10000 )
-variable sx   variable sy
-$10000 sx !   $10000 sy !
+$10000 value sx   $10000 value sy
 ( Translation )
-variable tx   variable ty
+0 value tx   0 value ty
 
 : hline { x y w }
-  \ x y pixel w 1- for color @ over l! 4 + next drop ;
-  x y pixel w color @ fill32 ;
+  \ x y pixel w 1- for color over l! 4 + next drop ;
+  x y pixel w color fill32 ;
 
 grf definitions also internals
 
-: color! ( col -- ) color ! ;
-
 : box { left top w h }
-  left sx @ * tx @ + 16 rshift to left
-  top sy @ * ty @ + 16 rshift to top
-  w sx @ * 16 rshift to w
-  h sy @ * 16 rshift to h
+  left sx * tx + 16 rshift to left
+  top sy * ty + 16 rshift to top
+  w sx * 16 rshift to w
+  h sy * 16 rshift to h
 
   left w + top h + { right bottom }
   left 0 max to left
diff --git a/ueforth/examples/heart_game.fs b/ueforth/examples/heart_game.fs
index 81bbc0f..ff82246 100755
--- a/ueforth/examples/heart_game.fs
+++ b/ueforth/examples/heart_game.fs
@@ -72,22 +72,22 @@ create arrow-table
 
 : draw-one { e } e ->kind @ { kind }
   HEART-GOAL kind = if
-    $ff0000 128 random dup 8 lshift + + color!
+    $ff0000 128 random dup 8 lshift + + to color
     e ->x @ 100 / e ->y @ 100 / e ->step @ heart
     exit
   then
   FIRE kind = if
-    $222222 color!
+    $222222 to color
     e ->x @ 100 / 4 - e ->y @ 100 / 4 - 8 8 box
     exit
   then
   SPARK kind = if
-    $ff7700 128 random 8 lshift + color!
+    $ff7700 128 random 8 lshift + to color
     e ->x @ 100 / 4 - e ->y @ 100 / 4 - 8 8 box
     exit
   then
   ARROW kind = if
-    $ffff00 256 random + color!
+    $ffff00 256 random + to color
     39 for
       e ->x @ 100 / e ->vx @ i 200 */ + i arrow-- 2/ -
       e ->y @ 100 / e ->vy @ i 200 */ + i arrow-- 2/ -
@@ -99,16 +99,16 @@ create arrow-table
 
 : volcano
   height 2/ for
-    $334400 i 100 height */ + color!
+    $334400 i 100 height */ + to color
     width 2/ i 2/ - i height 2/ + i height 8 / + 1 box
   next
-  0 color!
+  0 to color
   width 2/ height 2/
     height 8 / 20 box
 ;
 
 : draw
-  $003300 color! 0 0 width height box
+  $003300 to color 0 0 width height box
   volcano
   entity-count 0 ?do i entity draw-one loop
   flip