diff --git a/.gitignore b/.gitignore
index 78528ae33..b6cffd404 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,8 @@ cmake-build-debug/
 
 # Tool executables
 *.exe
+
+# Generated files
+*.4bpp
+*.lz
+*.gbapal
diff --git a/Makefile b/Makefile
index 3026cc2dc..57488dfbb 100644
--- a/Makefile
+++ b/Makefile
@@ -107,16 +107,19 @@ else
 NODEP := 1
 endif
 
-.PHONY: all clean tidy tools $(TOOLDIRS) patch_mwasmarm
+.PHONY: all clean mostlyclean tidy tools $(TOOLDIRS) patch_mwasmarm
 
 MAKEFLAGS += --no-print-directory
 
 all: $(ROM)
 	@$(SHA1SUM) -c $(TARGET).sha1
 
-clean: tidy
+clean: mostlyclean
 	make -C tools/mwasmarm_patcher clean
 
+mostlyclean: tidy
+	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' \) -exec $(RM) {} +
+
 tidy:
 	$(RM) -r $(BUILD_DIR)