diff --git a/docs/18-tutorial-breakout-artwork.md b/docs/18-tutorial-breakout-artwork.md
index 5802838..9cfc737 100644
--- a/docs/18-tutorial-breakout-artwork.md
+++ b/docs/18-tutorial-breakout-artwork.md
@@ -531,10 +531,12 @@ with the deadline:
 
 ```basic norun
 LABEL DRAWHUD
-GRAPHIC 1, 1
+GRAPHIC 1, 0
 WIDTH 1
 COLOR 0, 1 : COLOR 1, 4 : COLOR 2, 8 : COLOR 3, 5
 COLOR 4, 11 : COLOR 5, 16 : COLOR 6, 6
+Z$ = HBL$
+GSHAPE Z$, 0, 0
 BOX 5, 0, 56, 799, 57
 IF HN# = 1 THEN DRAW HC#(0), HX1#(0), HY1#(0) TO HX2#(0), HY2#(0)
 IF HN# < 2 THEN GOTO HUDONE
@@ -545,6 +547,16 @@ LABEL HUDONE
 RETURN
 ```
 
+**`GRAPHIC 1, 0` selects the graphics mode without clearing it**, and that is the whole
+difference between this routine and the ones that draw the field. Clearing here would take
+the field down with the old digits, so the strip is covered by Step 6's `HBL$` eraser at
+`0, 0` instead — the drawing stays, so the only way to remove something is to draw over it.
+`GRAPHIC 1, 1` is right in a routine that is about to redraw everything anyway.
+
+**`HUDTEXT` builds the stroke list and `DRAWHUD` replays it**, on different frames. Call
+`HUDTEXT` wherever a number in the HUD changes — level setup, a broken brick, a lost life,
+a caught gem — and it sets `DHUD# = 1`, which is all it takes to get the strip drawn.
+
 `HX1#()` to `HY2#()` are the stroke endpoints and `HC#()` is the colour source each stroke
 wants, so one pass over the list draws in as many colours as it likes: labels cyan, the
 score yellow, the lives green, the level red. **Seven colour sources is the ceiling**,
@@ -1793,6 +1805,10 @@ LABEL FILLROW
 FOR C# = 0 TO 9
   BRK#(R# * 10 + C#) = 1
   BRN# = BRN# + 1
+  SLX# = BRKX# + C# * 72
+  SLY# = BRKY# + R# * 24
+  SLI# = (R# * 10 + C#) + 1
+  SOLID SLI#, SLX#, SLY#, SLX# + 68, SLY# + 16
 NEXT C#
 RETURN