diff --git a/BUGS.md b/BUGS.md
index a0eba96..5e94e2a 100644
--- a/BUGS.md
+++ b/BUGS.md
@@ -4,12 +4,16 @@ BUGS
 This is a list of the software bugs (as opposed to the bugs in the game that you shoot) that still need attention:
 
 * The sound is muddy at times on real HW.  Especially when lots of stuff is going on, the sound ends up coming out garbled.  This isn't happening on emulators where everything is always quite clear.  Perhaps I am reaching some limit of the Ensoniq.  Do I need to reduce some sampling frequencies perhaps?
-* It seems to be possible to both shoot and be killed by the spider in a single frame.  Either the spider should be killed by the shot or the spider should kill the player but not both.
+    * I tried reducing the sampling frequency from 11025 for most of the samples to 5513 and I didn't notice any improvement in the quality of the sound on real HW.  Nor did I notice any real degredation on real HW or on an emulator.
 
 
 FIXED
 =======
 
+
+* It seems to be possible to both shoot and be killed by the spider in a single frame.  Either the spider should be killed by the shot or the spider should kill the player but not both.
+    * Based on the code, I don't think it is possible that this happened in a single frame.  Instead, I think what is happening is that the spider is being shot and then goes through a small number of explosion frames.  The colour used in those explosion frames were detected as a collision to the player.
+    * I have changed the colours of the explosion to no longer be detected as a collision for the player.
 * It is possible to shoot between two segments of a centipede.  The problem is that there are black pixels between the segments and if things are timed just right (or just wrong), the shot can slot in at those black pixels and end up missing both segments.
     * I am not sure how much can be done about this given how collisions are detected.
     * I have implemented a fix which I believe solves this problem.  The shot is a single pixel wide which allows it to slot in between a segment.  I have changed the collision code to detect a collision if it is also if there is any pixel on in the byte (ie two pixels wide).  That should ensure that the shot cannot pass through a centipede.  Note it also makes things slightly easier to hit where before it might have passed right next to.
diff --git a/BuGS/gamePlayer.s b/BuGS/gamePlayer.s
index 5577bac..e5aad65 100644
--- a/BuGS/gamePlayer.s
+++ b/BuGS/gamePlayer.s
@@ -57,12 +57,8 @@ initPlayer_loop2 anop
 		bne initPlayer_loop2
 		
 initPlayer_done anop
-		jmp playerSwitch
-
+		jmp scoreSwitchPlayer
 		
-playerSwitch entry
-		jsl scoreSwitchPlayer
-		rtl
 		
 playerLevelStart entry
 		stz playerIgnoreFirstPoll
diff --git a/BuGS/gameShot.s b/BuGS/gameShot.s
index 2313314..bdaf4cd 100644
--- a/BuGS/gameShot.s
+++ b/BuGS/gameShot.s
@@ -149,8 +149,8 @@ updateShot_collision anop
 		bge updateShot_onScreen
 		rtl
 updateShot_onScreen anop
-		and #$3333
-		bne updateShot_maybeMushroom
+		and #$cccc
+		beq updateShot_maybeMushroom
 		
 		txy
 		txa
diff --git a/BuGS/sprites/explosions.s b/BuGS/sprites/explosions.s
index 42b6f2b..2816343 100644
--- a/BuGS/sprites/explosions.s
+++ b/BuGS/sprites/explosions.s
@@ -16,9 +16,9 @@ explosions start spriteSeg
 explosion1 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green (c)
+; $2 - Red (4)
+; $3 - Off-white (8)
 ;
 ; ..RR|.R..
 ; .OGR|G...
@@ -32,22 +32,22 @@ explosion1 entry
         
         lda $0,s
         and #$00ff
-        ora #$4400
+        ora #$2200
         sta $0,s
         
         lda $2,s
         and #$fff0
-        ora #$0004
+        ora #$0002
         sta $2,s
         
         lda $a0,s
         and #$00f0
-        ora #$c408
+        ora #$1203
         sta $a0,s
         
         lda $a2,s
-;        and #$ff0f     not necessary with pure green
-        ora #$00c0
+        and #$ff0f
+        ora #$0010
         sta $a2,s
         
         tsc
@@ -55,22 +55,21 @@ explosion1 entry
         tcs
 
         lda $0,s
-;        and #$ff0f     not necessary with pure green
-        ora #$cc0c
+        and #$ff0f
+        ora #$1101
         sta $0,s
         
         lda $2,s
         and #$0f00
-        ora #$40cc
+        ora #$2011
         sta $2,s
         
-
-        lda #$cc4c
+        lda #$1121
         sta $a0,s
         
         lda $a2,s
         and #$0f00
-        ora #$80cc
+        ora #$3011
         sta $a2,s
         
         tsc
@@ -79,18 +78,18 @@ explosion1 entry
         
         lda $0,s
         and #$0f00
-        ora #$c04c
+        ora #$1021
         sta $0,s
         
         lda $2,s
-;        and #$fff0     not necessary with pure green
-        ora #$c0cc
+        and #$fff0
+        ora #$1011
         sta $2,s
 
-        lda #$cc8c
+        lda #$1131
         sta $a0,s
         
-        lda #$8ccc
+        lda #$3111
         sta $a0,s
         
         tsc
@@ -99,22 +98,22 @@ explosion1 entry
         
         lda $0,s
         and #$00f0
-        ora #$cc08
+        ora #$1103
         sta $0,s
         
         lda $2,s
         and #$0f00
-        ora #$804c
+        ora #$3021
         sta $2,s
         
         lda $a0,s
         and #$00f0
-        ora #$8404
+        ora #$3202
         sta $a0,s
         
         lda $a2,s
         and #$f0f0
-        ora #$0c04
+        ora #$0102
         sta $a2,s
         
         _spriteFooter
@@ -124,9 +123,9 @@ explosion1 entry
 explosion2 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green
+; $2 - Red
+; $3 - Off-white
 ;
 ; ..GR|G.R.
 ; .GGG|GGRG
@@ -140,61 +139,61 @@ explosion2 entry
 
         lda $0,s
         and #$00ff
-        ora #$c400
+        ora #$1200
         sta $0,s
         
         lda $2,s
         and #$0f0f
-        ora #$40c0
+        ora #$2010
         sta $2,s
         
         lda $a0,s
-;        and #$00f0     not necessary with pure green
-        ora #$cc0c
+        and #$00f0
+        ora #$1101
         sta $a0,s
         
-        lda #$4ccc
+        lda #$2111
         sta $a2,s
         
         tsc
         adc #$143
         tcs
         
-        pea $c8cc
-        pea $cc8c
+        pea $1311
+        pea $1131
         
         adc #$a0
         tcs
         
-        pea $cc8c
-        pea $c88c
+        pea $1131
+        pea $1331
         
         adc #$a0
         tcs
         
-        pea $c88c
-        pea $c88c
+        pea $1331
+        pea $1331
         
         adc #$a0
         tcs
         
-        pea $cccc
-        pea $cc8c
+        pea $1111
+        pea $1131
         
         adc #$a0
         tcs
         
-        pea $c8cc
-        pea $c48c
+        pea $1311
+        pea $1231
         
         lda $a1,s
         and #$f0f0
-        ora #$040c
+        ora #$0201
         sta $a1,s
         
         lda $a3,s
-;        and #$f0f0         not necessary for pure green
-        ora #$000c
+        and #$f0f0
+        ora #$0001
         sta $a3,s
         
         _spriteFooter
@@ -204,9 +203,9 @@ explosion2 entry
 explosion3 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green
+; $2 - Red
+; $3 - Off-white
 ;
 ; .GOG|RG..
 ; G.GG|GGGR
@@ -219,43 +218,43 @@ explosion3 entry
         
         lda $0,s
         and #$00f0
-        ora #$8c0c
+        ora #$3101
         sta $0,s
         
         lda $2,s
         and #$ff00
-        ora #$004c
+        ora #$0021
         sta $2,s
         
         lda $a0,s
-;        and #$000f     not necessary with pure green
-        ora #$ccc0
+        and #$000f
+        ora #$1110
         sta $a0,s
         
-        lda #$c4cc
+        lda #$1211
         sta $a2,s
         
         tsc
         adc #$140
         tcs
         
-        lda #$c8cc
+        lda #$1311
         sta $0,s
         
         lda $2,s
         and #$0f00
-        ora #$c0c8
+        ora #$1013
         sta $2,s
         
 
         lda $a0,s
         and #$0f00
-        ora #$804c
+        ora #$3021
         sta $a0,s
         
         lda $a2,s
-;        and #$00f0     not necessary with pure green
-        ora #$cc0c
+        and #$00f0
+        ora #$1101
         sta $a2,s
         
         tsc
@@ -263,41 +262,41 @@ explosion3 entry
         tcs
         
         lda $0,s
-;        and #$ff00     not necessary with pure green
-        ora #$00cc
+        and #$ff00
+        ora #$0011
         sta $0,s
         
         lda $2,s
-;        and #$fff0     not necessary with pure green
-        ora #$000c
+        and #$fff0
+        ora #$0001
         sta $2,s
 
-        lda #$4cc4
+        lda #$2112
         sta $a0,s
         
-        lda #$cc4c
+        lda #$1121
         sta $a2,s
         
         tsc
         adc #$140
         tcs
         
-        lda #$cc4c
+        lda #$1121
         sta $0,s
         
         lda $2,s
-;        and #$0f00     not necessary with pure green
-        ora #$c0cc
+        and #$0f00
+        ora #$1011
         sta $2,s
         
         lda $a0,s
         and #$0ff0
-        ora #$c008
+        ora #$1003
         sta $a0,s
         
         lda $a2,s
         and #$f0f0
-        ora #$080c
+        ora #$0301
         sta $a2,s
         
         _spriteFooter
@@ -323,22 +322,22 @@ explosion4 entry
 
         lda $0,s
         and #$000f
-        ora #$c8c0
+        ora #$1310
         sta $0,s
         
         lda $2,s
         and #$f0f0
-        ora #$0c04
+        ora #$0102
         sta $2,s
         
         lda $a0,s
         and #$f0f0
-        ora #$0c08
+        ora #$0103
         sta $a0,s
         
         lda $a2,s
-;        and #$0f0f     not necessary with pure green
-        ora #$c0c0
+        and #$0f0f
+        ora #$1010
         sta $a2,s
         
         tsc
@@ -347,22 +346,22 @@ explosion4 entry
         
         lda $0,s
         and #$f000
-        ora #$044c
+        ora #$0221
         sta $0,s
         
         lda $2,s
         and #$f0f0
-        ora #$0408
+        ora #$0203
         sta $2,s
         
         lda $a0,s
         and #$0f0f
-        ora #$40c0
+        ora #$2010
         sta $a0,s
         
         lda $a2,s
-;        and #$0fff     not necessary with pure green
-        ora #$c000
+        and #$0fff
+        ora #$1000
         sta $a2,s
         
         tsc
@@ -370,23 +369,23 @@ explosion4 entry
         tcs
         
         lda $0,s
-;        and #$ff00     not necessary with pure green
-        ora #$00cc
+        and #$ff00
+        ora #$0011
         sta $0,s
         
         lda $2,s
         and #$f0ff
-        ora #$0800
+        ora #$0300
         sta $2,s
         
         lda $a0,s
         and #$f0f0
-        ora #$0404
+        ora #$0202
         sta $a0,s
         
         lda $a2,s
         and #$00f0
-        ora #$c804
+        ora #$1302
         sta $a2,s
         
         tsc
@@ -395,22 +394,22 @@ explosion4 entry
 
         lda $0,s
         and #$0f0f
-        ora #$4080
+        ora #$2030
         sta $0,s
         
         lda $2,s
         and #$000f
-        ora #$c440
+        ora #$1220
         sta $2,s
         
         lda $a0,s
         and #$f000
-        ora #$0c4c
+        ora #$0121
         sta $a0,s
         
         lda $a2,s
         and #$0f00
-        ora #$80cc
+        ora #$3011
         sta $a2,s
         
         _spriteFooter
@@ -435,23 +434,23 @@ explosion5 entry
 ;
         
         lda $0,s
-;        and #$000f     not necessary with pure green
-        ora #$000c
+        and #$000f
+        ora #$0001
         sta $0,s
         
         lda $2,s
-;        and #$f0f0     not necessary with pure green
-        ora #$c0c0
+        and #$f0f0
+        ora #$1010
         sta $2,s
         
         lda $a0,s
         and #$00f0
-        ora #$8c04
+        ora #$3102
         sta $a0,s
         
         lda $a2,s
         and #$0ff0
-        ora #$c004
+        ora #$1002
         sta $a2,s
         
         tsc
@@ -460,22 +459,22 @@ explosion5 entry
         
         lda $0,s
         and #$ff00
-        ora #$00c8
+        ora #$0013
         sta $0,s
         
         lda $2,s
         and #$f00f
-        ora #$08c0
+        ora #$0310
         sta $2,s
         
         lda $a0,s
         and #$fff0
-        ora #$0004
+        ora #$0002
         sta $a0,s
         
         lda $a2,s
         and #$0fff
-        ora #$4000
+        ora #$2000
         sta $a2,s
         
         tsc
@@ -484,22 +483,22 @@ explosion5 entry
         
         lda $0,s
         and #$0f0f
-        ora #$40c0
+        ora #$2010
         sta $0,s
         
         lda $2,s
         and #$f0f0
-        ora #$0404
+        ora #$0202
         sta $2,s
         
         lda $a0,s
         and #$f0f0
-        ora #$0c08
+        ora #$0103
         sta $a0,s
         
         lda $a2,s
         and #$0ff0
-        ora #$800c
+        ora #$3001
         sta $a2,s
         
         tsc
@@ -508,22 +507,22 @@ explosion5 entry
 
         lda $0,s
         and #$0f00
-        ora #$404c
+        ora #$2021
         sta $0,s
         
         lda $2,s
-;        and #$0fff     not necessary with pure green
-        ora #$c000
+        and #$0fff
+        ora #$1000
         sta $2,s
         
         lda $a0,s
-;        and #$f0f0     not necessary with pure green
-        ora #$0c0c
+        and #$f0f0
+        ora #$0101
         sta $a0,s
         
         lda $a2,s
         and #$ff00
-        ora #$0084
+        ora #$0032
         sta $a2,s
         
         _spriteFooter
@@ -549,22 +548,22 @@ explosion6 entry
         
         lda $0,s
         and #$f0f0
-        ora #$0c08
+        ora #$0103
         sta $0,s
         
         lda $2,s
-;        and #$0fff     not necessary with pure green
-        ora #$c000
+        and #$0fff
+        ora #$1000
         sta $2,s
         
         lda $a0,s
         and #$0f0f
-        ora #$c040
+        ora #$1020
         sta $a0,s
         
         lda $a2,s
         and #$f000
-        ora #$0484
+        ora #$0232
         sta $a2,s
         
         tsc
@@ -572,37 +571,37 @@ explosion6 entry
         tcs
 
         lda $a0,s
-;        and #$ff0f     not necessary with pure green
-        ora #$00c0
-        sta $a0,s
-        
-        lda $a2,s
-;        and #$0fff     not necessary with pure green
-        ora #$c000
-        sta $a2,s
-        
-        tsc
-        adc #$140
-        tcs
-        
-        lda $0,s
-        and #$fff0
-        ora #$0008
-        sta $0,s
-        
-        lda $2,s
-;        and #$f0ff     not necessary with pure green
-        ora #$0c00
-        sta $2,s
-        
-        lda $a0,s
-        and #$fff0
-        ora #$0008
+        and #$ff0f
+        ora #$0010
         sta $a0,s
         
         lda $a2,s
         and #$0fff
-        ora #$8000
+        ora #$1000
+        sta $a2,s
+        
+        tsc
+        adc #$140
+        tcs
+        
+        lda $0,s
+        and #$fff0
+        ora #$0003
+        sta $0,s
+        
+        lda $2,s
+        and #$f0ff
+        ora #$0100
+        sta $2,s
+        
+        lda $a0,s
+        and #$fff0
+        ora #$0003
+        sta $a0,s
+        
+        lda $a2,s
+        and #$0fff
+        ora #$3000
         sta $a2,s
         
         tsc
@@ -611,22 +610,22 @@ explosion6 entry
 
         lda $0,s
         and #$0f0f
-        ora #$c040
+        ora #$1020
         sta $0,s
         
         lda $2,s
-;        and #$f0ff     not necessary with pure green
-        ora #$0c00
+        and #$f0ff
+        ora #$0100
         sta $2,s
         
         lda $a0,s
         and #$f0f0
-        ora #$0808
+        ora #$0303
         sta $a0,s
         
         lda $a2,s
         and #$0f0f
-        ora #$4040
+        ora #$2020
         sta $a2,s
         
         _spriteFooter
diff --git a/BuGS/sprites/scores.s b/BuGS/sprites/scores.s
index 74b6d75..4ef1dd0 100644
--- a/BuGS/sprites/scores.s
+++ b/BuGS/sprites/scores.s
@@ -16,9 +16,9 @@ scores start spriteSeg
 score300 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green
+; $2 - Red
+; $3 - Off-white
 ;
 ; ....|....|....
 ; ....|....|....
@@ -123,9 +123,9 @@ score300 entry
 score600 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green
+; $2 - Red
+; $3 - Off-white
 ;
 ; ....|....|....
 ; ....|....|....
@@ -231,9 +231,9 @@ score600 entry
 score900 entry
         _spriteHeader
  
-; $c - Green
-; $4 - Red
-; $8 - Off-white
+; $1 - Green
+; $2 - Red
+; $3 - Off-white
 ;
 ; ....|....|....
 ; ....|....|....
diff --git a/BuGS/sprites/sprites.md b/BuGS/sprites/sprites.md
index 396af36..24343a9 100644
--- a/BuGS/sprites/sprites.md
+++ b/BuGS/sprites/sprites.md
@@ -40,10 +40,14 @@ Each colour is 4 bits wide.  All zeros is always black in all the different pall
    * numbers
    * letters
    * symbols
+   * spider scores (300, 600 and 900)
+   * bug explosions
    * solid squares (primarily the all black square)
    
-These sprites generally draw first and overwrite what may have been there before.  After the background layer is drawn, other things are drawn in this order:
-  * spiders/scores
+These sprites generally draw first and overwrite what may have been there before.  There are exceptions though.  Spider scores and bug explosions do generally layer on top of the background but these things still use the "background colours" when drawn.  The reason for this is that these background colours are not considered to be a collision if present when the player is drawn.  We do not want the player to be considered dead just because it touched a spider score or bug explosion.
+
+After the background layer is drawn, other things are drawn in this order:
+  * spiders
   * scorpions
   * fleas
   * centipede segments
@@ -63,3 +67,9 @@ An exception to the "background is drawn first" rule though is the non-playable
 We also need to clip a flea which is dropping down from the top.  The solution there is that the game allocates memory before the SHR page, enough for an extra unseen tile above the screen.  A partially obscured flea is drawn offscreen into that part of memory before the SHR page.
 
 There is a similar problem when the flea reaches the bottom of the screen.  I have decided to just not handle it.  The flea disappears once it reaches the bottom of the screen.  It does not scroll off the bottom.
+
+## Collisions
+
+There are two sprites which need to detect collisions.  We need to detect if the player has collided with a bug when we draw the player.  The way that is done is that any pixel that the player will draw, we check to see if anding that pixel with $c results in a non-zero value.  At least one of those two high bits will be set if the pixel has been drawn by a bug.  Background sprites never set those bits.  From there, we need to figure out if the bug that was collided with is a spider, flea of centipede segment.  The player cannot collide with a scorpion because the are always in different parts of the screen.  Once we know there is a collision, the code looks for tile overlap between the player and the spider, flea or centipede segment in order to figure out what collided.
+
+The player's shot also collides with these things but also collides with mushrooms which are a background sprite.  So, in this case, any non-zero value in a pixel being drawn to by the shot is considered to be a collision.  In fact, the shot is only one pixel wide but a collision is said to occur if either nibble in the byte is non-zero.  Once we have the data from the collision, that is anded with $c and if that is zero, that indicates that a mushroom collision may have occurred.  Based on the address of the collision, that turns into a tile lookup.  Otherwise, that may be a bug collision.  As with player collisions, a check for tile overlap is what is used to figure out what kind of bug caused the collision.