diff --git a/Makefile b/Makefile
index a7ff5c1..fd498ed 100644
--- a/Makefile
+++ b/Makefile
@@ -32,4 +32,7 @@ main.o: sud.h solve.h
 sud.o: sud.h
 solve.o: solve.h
 
+puzzles: sudoku.csv
+	pv sudoku.csv | tail -n+2 | cut -d, -f1 | tr -d '\n' > $@
+
 .PHONY: clean