diff --git a/Makefile b/Makefile
index d898ed92d..6cb43139e 100644
--- a/Makefile
+++ b/Makefile
@@ -48,6 +48,7 @@ asm: md
 	$(ACME) src/fx/fx.hgr.iris.a
 	$(ACME) src/fx/fx.hgr.ripple.a
 	$(ACME) src/fx/fx.hgr.star.a
+	$(ACME) src/fx/fx.hgr.fourspiral.a
 
 dsk: md asm
 	$(CADIUS) CREATEVOLUME build/"$(DISK)" "${VOLUME}" 32766KB >>build/log
diff --git a/res/fx.conf b/res/fx.conf
index 9afb1f854..d3a52ded0 100644
--- a/res/fx.conf
+++ b/res/fx.conf
@@ -1 +1 @@
-#
# transition effects for HGR slideshows
#
STAR
RIPPLE
IRIS
SPLIT.UD.INTRO
RADIAL
SUNRISE
DIAGONAL
CHECKERBOARD
HALF.FIZZLE
CORNER.CIRCLE
BAR.DISSOLVE
STAGGERWHITE.LR
DIAMOND
ONESQUARE
TWOPASS.LR
CRYSTAL
HALF.MOSAIC
STAGGER.LR
FOURSQUARE
STAGGER.UD
INTERLOCK.LR
BLOCK.MOSAIC
FIZZLE
STAGGERWHITE.UD
INTERLOCK.UD
BLOCK.FIZZLE
SPIRAL

[eof]
\ No newline at end of file
+#
# transition effects for HGR slideshows
#
FOURSPIRAL
STAR
RIPPLE
IRIS
SPLIT.UD.INTRO
RADIAL
SUNRISE
DIAGONAL
CHECKERBOARD
HALF.FIZZLE
CORNER.CIRCLE
BAR.DISSOLVE
STAGGERWHITE.LR
DIAMOND
ONESQUARE
TWOPASS.LR
CRYSTAL
HALF.MOSAIC
STAGGER.LR
FOURSQUARE
STAGGER.UD
INTERLOCK.LR
BLOCK.MOSAIC
FIZZLE
STAGGERWHITE.UD
INTERLOCK.UD
BLOCK.FIZZLE
SPIRAL

[eof]
\ No newline at end of file
diff --git a/res/fx/_FileInformation.txt b/res/fx/_FileInformation.txt
index 8b2f724e3..2a57bb305 100644
--- a/res/fx/_FileInformation.txt
+++ b/res/fx/_FileInformation.txt
@@ -25,3 +25,4 @@ SPLIT.UD.INTRO=Type(06),AuxType(6000),Access(C3)
 IRIS=Type(06),AuxType(6000),Access(C3)
 RIPPLE=Type(06),AuxType(6000),Access(C3)
 STAR=Type(06),AuxType(6000),Access(C3)
+FOURSPIRAL=Type(06),AuxType(6000),Access(C3)
diff --git a/src/fx/fx.hgr.fourspiral.a b/src/fx/fx.hgr.fourspiral.a
new file mode 100644
index 000000000..57d3f0de9
--- /dev/null
+++ b/src/fx/fx.hgr.fourspiral.a
@@ -0,0 +1,90 @@
+!cpu 6502
+!to "build/FX/FOURSPIRAL",plain
+*=$6000
+
+         lda   #$13
+         sta   $FB
+         lda   #$17
+         sta   $FD
+         lda   #$00
+         sta   $FA
+         sta   $FC
+@outerloop
+         lda   $FC
+         sta   $FE
+         lda   $FA
+         sta   $FF
+         lda   #$00
+         sta   $F9
+@loop    lda   $FE
+         ldy   $FF
+         jsr   HGRHalfBlockCopy
+         lda   #$27
+         sec
+         sbc   $FF
+         tay
+         lda   $FE
+         jsr   HGRHalfBlockCopy
+         lda   #$2F
+         sec
+         sbc   $FE
+         pha
+         jsr   HGRHalfBlockCopy
+         pla
+         ldy   $FF
+         jsr   HGRHalfBlockCopy
+         lda   #$28
+         jsr   WaitForKeyWithTimeout
+         bmi   @exit
+         ldx   $F9
+         bne   @a
+         inc   $FF
+         lda   $FB
+         cmp   $FF
+         bcs   @loop
+         inc   $FC
+         inc   $F9
+         lda   $FC
+         sta   $FE
+         lda   $FB
+         sta   $FF
+@a       dex
+         bne   @b
+         inc   $FE
+         lda   $FD
+         cmp   $FE
+         bcs   @loop
+         dec   $FB
+         inc   $F9
+         lda   $FD
+         sta   $FE
+         lda   $FB
+         sta   $FF
+@b       dex
+         bne   @c
+         dec   $FF
+         lda   $FF
+         cmp   $FA
+         bpl   @loop
+         lda   $FD
+         cmp   $FC
+         beq   @exit
+         dec   $FD
+         inc   $F9
+         lda   $FD
+         sta   $FE
+         lda   $FA
+         sta   $FF
+@c       dex
+         bne   @loop
+         dec   $FE
+         lda   $FE
+         cmp   $FC
+         bpl   @loop
+         inc   $FA
+         beq   @exit
+         jmp   @outerloop
+@exit    rts
+
+         !source "src/wait.a"
+         !source "src/fx/fx.hgr.common.a"