diff --git a/bitplane-thingie.p8 b/bitplane-thingie.p8
index 88175dd..bfa5610 100644
--- a/bitplane-thingie.p8
+++ b/bitplane-thingie.p8
@@ -101,6 +101,30 @@ function draw_ui()
  rect(0,112,127,112,7)
  rect(127,112,127,127,5)
  rect(0,127,127,127,5)
+ 
+ -- draw "nuke" button
+ spr(21,0,112,2,2)
+ 
+ print("clr", 19, 118, 1)
+ print("clr", 18, 117, 7) 
+ -- draw "color" bits
+ for i=0,3 do
+  draw_ui_checkbox(32 + 9*i, plane_mask & 1<<i ~= 0,i)
+ end
+ 
+ print("mask", 73, 118, 1)
+ print("mask", 72, 117, 7)
+ -- draw "mask" bits
+ for i=0,3 do
+  draw_ui_checkbox(90 + 9*i, plane_mask & 1<<(i+4) ~= 0, i)
+ end
+end
+
+function draw_ui_checkbox(x, checked, n)
+ spr(checked and 18 or 17,
+     x,
+     113)
+ spr(33+n, x, 121)
 end
 
 function handle_ui_click(x, y)
@@ -140,9 +164,15 @@ __gfx__
 00000000005500000055000000550000005500000055000000550000005500000055000000000000000000000000000000000000000000000000000000000000
 00000000555555565555555600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 00000000511111165111111600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000511111165117711600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000511111165177771600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000511111165177771600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000511111165117711600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000511111165111111600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
-00000000666666666666666600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+00000000511111165117711600000000000000000066666666666600000000000000000000000000000000000000000000000000000000000000000000000000
+00000000511111165177771600000000000000000062228222282500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000511111165177771600000000000000000068898898882500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000511111165117711600000000000000000062889999822500000000000000000000000000000000000000000000000000000000000000000000000000
+0000000051111116511111160000000000000000006229aaaa888500000000000000000000000000000000000000000000000000000000000000000000000000
+000000006666666666666666000000000000000000688a7779888500000000000000000000000000000000000000000000000000000000000000000000000000
+000000000007000000077000007070000007700000688977aa892500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000007710000070170000717100007017000062899aa9888500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000000710000001701000777700000770100062999aa9888500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000000710000007010000017110007017000062889998288500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000007770000077770000007100000770100068822998888500000000000000000000000000000000000000000000000000000000000000000000000000
+00000000000111000001111000000100000011000065555555555500000000000000000000000000000000000000000000000000000000000000000000000000