diff --git a/Makefile b/Makefile
index 7838b61..387663b 100644
--- a/Makefile
+++ b/Makefile
@@ -3,10 +3,7 @@
 FIRE_ANIM = $(foreach angle, $(shell seq 0 6 359), build/fire$(angle).png)
 PEACH_DECAY_ANIM = $(foreach percent, $(shell seq 99 -1 0), build/peach-decay$(percent).png)
 PEACH_RAINBOW_ANIM = $(foreach percent, $(shell seq 100 2 299), build/peach-rainbow$(percent).png)
-PORTAL_A_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-a$(angle).png)
-PORTAL_B_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-b$(angle).png)
-PORTAL_C_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-c$(angle).png)
-PORTAL_D_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-d$(angle).png)
+PORTAL_ANIM = $(foreach angle, $(shell seq 0 6 359), build/portal-a$(angle).png)
 
 IMAGES = $(foreach name, apple wall oil key door, public/assets/$(name)32.png)
 TILESETS = $(foreach name, hole switch spikes, public/assets/$(name)-ts.png)
@@ -62,30 +59,17 @@ public/assets/peach-rainbow-anim.png: $(PEACH_RAINBOW_ANIM)
 build/peach-rainbow%.png: assets/peach.png
 	convert $^ -modulate 100,100,$(shell echo $@ | sed 's/[^0-9]*//g') -resize 32x $@
 
-build/portal-b.png: assets/portal.png
-	convert $^ -modulate 100,100,200 $@
-build/portal-c.png: assets/portal.png
-	convert $^ -modulate 100,100,150 $@
-build/portal-d.png: assets/portal.png
-	convert $^ -modulate 100,100,50 $@
-
 build/portal-a%.png: assets/portal.png
 	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize 32x $@
-build/portal-b%.png: build/portal-b.png
-	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize 32x $@
-build/portal-c%.png: build/portal-c.png
-	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize 32x $@
-build/portal-d%.png: build/portal-d.png
-	convert $^ -distort ScaleRotateTranslate $(shell echo $@ | sed 's/[^0-9]*//g') -resize 32x $@
 
-public/assets/portal-a-anim.png: $(PORTAL_A_ANIM)
-	convert $^ -append $@
-public/assets/portal-b-anim.png: $(PORTAL_B_ANIM)
-	convert $^ -append $@
-public/assets/portal-c-anim.png: $(PORTAL_C_ANIM)
-	convert $^ -append $@
-public/assets/portal-d-anim.png: $(PORTAL_D_ANIM)
+public/assets/portal-a-anim.png: $(PORTAL_ANIM)
 	convert $^ -append $@
+public/assets/portal-b-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,200 $@
+public/assets/portal-c-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,150 $@
+public/assets/portal-d-anim.png: public/assets/portal-a-anim.png
+	convert $^ -modulate 100,100,50 $@
 
 public/assets/%.json: assets/%.json
 	cp $^ $@