diff --git a/fillit/.tags b/fillit/.tags
new file mode 100644
index 00000000..1d1c0ede
--- /dev/null
+++ b/fillit/.tags
@@ -0,0 +1,20 @@
+Mmain	src/main.c	/^int		main(int ac, char **av)$/
+ft_board_add	src/lib_board.c	/^int		ft_board_add(char **board, t_ttmn ttmn, int i/
+ft_board_copy	src/lib_board.c	/^char	**ft_board_copy(char **board)$/
+ft_board_fill	src/lib_board.c	/^void	ft_board_fill(char **dst, char **src)$/
+ft_board_free	src/lib_board.c	/^void	ft_board_free(char ***board)$/
+ft_board_init	src/lib_board.c	/^char	**ft_board_init(size_t size)$/
+ft_board_print	src/lib_board.c	/^void	ft_board_print(char **board)$/
+ft_board_remove	src/lib_board.c	/^void	ft_board_remove(char **board, char c)$/
+ft_board_replace	src/lib_board.c	/^void	ft_board_replace(char **board, char a, char b/
+ft_check_waste	src/fillit_check_waste.c	/^int		ft_check_waste(char **board, t_list *lttmn, i/
+ft_fit_blob	src/fillit_fit_blob.c	/^int		ft_fit_blob(char **board, t_list *lttmn, int /
+ft_floodfill_recursive	src/floodfill.c	/^int		ft_floodfill_recursive(char **board, int size/
+ft_floodfill_stack	src/floodfill.c	/^int		ft_floodfill_stack(char **board, int size, in/
+ft_parse_ttmn	src/fillit_parser.c	/^t_list	*ft_parse_ttmn(char *filename)$/
+ft_show_ttmn	src/lib_ttmn.c	/^void	ft_show_ttmn(t_ttmn ttmn)$/
+ft_solved	src/fillit_solver.c	/^int		ft_solved(char **board)$/
+ft_solver	src/fillit_solver.c	/^int		ft_solver(char **board, t_list *lttmn, int sp/
+ft_ttmn_reset	src/lib_ttmn.c	/^void	ft_ttmn_reset(t_list *ttmn)$/
+ft_usage	src/main.c	/^void	ft_usage(void)$/
+ft_validate_ttmn	src/fillit_parser.c	/^int		ft_validate_ttmn(t_ttmn ttmn)$/
diff --git a/fillit/Makefile b/fillit/Makefile
index 6f7aa05c..26064048 100644
--- a/fillit/Makefile
+++ b/fillit/Makefile
@@ -1,5 +1,6 @@
 NAME	=	fillit
 CC		=	gcc
+TAGFILE	=	.tags
 
 D_SRC	=	src
 F_SRC	:=	$(shell ls -1 $(D_SRC) | grep "\.c$$")
@@ -22,9 +23,13 @@ D_FLAGS	=
 MKDIR	=	mkdir -p
 RM		=	/bin/rm -rf
 
-.PHONY: all clean fclean re lib/libft
+.PHONY: all clean fclean re tags lib/libft
 
-all: $(NAME)
+all: $(NAME) tags
+
+tags:
+	@ctags -f $(TAGFILE) $(addprefix $(D_SRC)/, $(F_SRC))
+	@echo "Making tags..."
 
 $(D_OBJ)/%.o: $(D_SRC)/%.c $(D_INC)
 	@$(MKDIR) $(D_OBJ)
diff --git a/fillit/includes/fillit.h b/fillit/includes/fillit.h
index 8560cbdf..9f896c22 100644
--- a/fillit/includes/fillit.h
+++ b/fillit/includes/fillit.h
@@ -28,10 +28,9 @@ int		ft_solver(char **board, t_list *lttmn, int space, int size);
 int		ft_solved(char **board);
 
 int		ft_check_waste(char **board, t_list *lttmn, int space, int size);
-int		ft_flood_fill(char **board, int size, int i, char c);
-
-int		ft_blobs(char **board, t_list *lttmn, int space, int size);
 int		ft_fit_blob(char **board, t_list *lttmn, int space, int size, int blob_size, int i);
+int		ft_floodfill_recursive(char **board, int size, int i, char c);
+int		ft_floodfill_stack(char **board, int size, int i, char c);
 
 void	ft_board_print(char **board);
 char	**ft_board_init(size_t size);
diff --git a/fillit/src/fillit_check_waste.c b/fillit/src/fillit_check_waste.c
index 1005a797..eeeaa3dc 100644
--- a/fillit/src/fillit_check_waste.c
+++ b/fillit/src/fillit_check_waste.c
@@ -18,7 +18,10 @@ int		ft_check_waste(char **board, t_list *lttmn, int space, int size)
 		if (board[i / size][i % size] != '.')
 			continue ;
 		ft_board_replace(board, '*', '^');
-		blob_size = ft_flood_fill(board, size, i, '*');
+		blob_size = ft_floodfill_recursive(board, size, i, '*');
+		/* ft_board_print(board); */
+		/* printf("blob size = %i\n", blob_size); */
+		/* fflush(stdout); */
 		space -= blob_size % 4;
 
 		if (space < 0)
diff --git a/fillit/src/parser.c b/fillit/src/fillit_parser.c
similarity index 80%
rename from fillit/src/parser.c
rename to fillit/src/fillit_parser.c
index 371b6af7..21ffbe2e 100644
--- a/fillit/src/parser.c
+++ b/fillit/src/fillit_parser.c
@@ -57,8 +57,6 @@ t_list	*ft_parse_ttmn(char *filename)
 		i = 0;
 		while (buf[i])
 		{
-			/* printf("%i, %i, %i: '%c'\n", i, j, k, buf[i]); */
-			/* fflush(stdout); */
 			if (buf[i] == '.')
 				;
 			else if (buf[i] == '#')
@@ -89,16 +87,7 @@ t_list	*ft_parse_ttmn(char *filename)
 					if (!ft_validate_ttmn(ttmn))
 						return (0);
 					tmp = ft_lstnew(&ttmn , sizeof(t_ttmn));
-					/* printf("list: %p\n", list); */
-					/* printf("new: %p\n", tmp); */
-					/* printf("new->next: %p\n", tmp->next); */
-					/* fflush(stdout); */
 					ft_lsteadd(&list, tmp);
-					/* printf("list: %p\n", list); */
-					/* printf("list->next: %p\n", list->next); */
-					/* fflush(stdout); */
-					/* ft_show_ttmn(*(t_ttmn*)list->content); */
-					/* ft_show_ttmn(*(t_ttmn*)ft_lstlast(list)->content); */
 					j = -1;
 					k = 0;
 				}
diff --git a/fillit/src/flood_fill.c b/fillit/src/flood_fill.c
deleted file mode 100644
index b9990346..00000000
--- a/fillit/src/flood_fill.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include "fillit.h"
-
-int		ft_flood_fill(char **board, int size, int i, char c)
-{
-	int		n;
-
-	n = 0;
-	if (board[i / size][i % size] == '.')
-	{
-		board[i / size][i % size] = c;
-		n++;
-		n += i % size < size - 1 ?  ft_flood_fill(board, size, i + 1, c) : 0;
-		n += i / size > 0 ? ft_flood_fill(board, size, i - size, c) : 0;
-		n += i % size > 0 ? ft_flood_fill(board, size, i - 1, c) : 0;
-		n += i / size < size - 1 ? ft_flood_fill(board, size, i + size, c) : 0;
-	}
-	/* printf("list at %i: ", i); */
-	/* fflush(stdout); */
-	/* ft_lst_print(blob, &ft_putnbr); */
-	return (n);
-}
diff --git a/fillit/src/floodfill.c b/fillit/src/floodfill.c
new file mode 100644
index 00000000..3728bc6b
--- /dev/null
+++ b/fillit/src/floodfill.c
@@ -0,0 +1,66 @@
+#include "fillit.h"
+
+int		ft_floodfill_recursive(char **board, int size, int i, char c)
+{
+	int		n;
+
+	n = 0;
+	if (board[i / size][i % size] == '.')
+	{
+		board[i / size][i % size] = c;
+		n++;
+		n += i % size < size - 1 ?  ft_floodfill_recursive(board, size, i + 1, c) : 0;
+		n += i / size > 0 ? ft_floodfill_recursive(board, size, i - size, c) : 0;
+		n += i % size > 0 ? ft_floodfill_recursive(board, size, i - 1, c) : 0;
+		n += i / size < size - 1 ? ft_floodfill_recursive(board, size, i + size, c) : 0;
+	}
+	/* printf("list at %i: ", i); */
+	/* fflush(stdout); */
+	/* ft_lst_print(blob, &ft_putnbr); */
+	return (n);
+}
+
+int		ft_floodfill_stack(char **board, int size, int i, char c)
+{
+	static const int dx[4] = {1, -1, 0, 0};
+	static const int dy[4] = {0, 0, 1, -1};
+	int		x;
+	int		y;
+	int		nx;
+	int		ny;
+	int		n;
+	t_list	*top;
+	t_list	*stack;
+	t_list	*stack2;
+
+	stack = NULL;
+	stack2 = NULL;
+	n = 0;
+	ft_lstadd(&stack, ft_lstnew(&i, sizeof(int)));
+	while (stack || stack2)
+	{
+		if (stack2)
+			stack = stack2;
+		stack2 = NULL;
+		/* ft_board_print(board); */
+		while((top = ft_lstpop(&stack)))
+		{
+			i = *(int *)top->content;
+			x = i % size;
+			y = i / size;
+			board[y][x] = c;
+			for(int j = 0; j < 4; j++) {
+				nx = x + dx[j];
+				ny = y + dy[j];
+				i = nx + size * ny;
+				if(nx >= 0 && nx < size && ny >= 0 && ny < size
+						&& board[ny][nx] == '.')
+				{
+					ft_lstadd(&stack2, ft_lstnew(&i, sizeof(int)));
+					n++;
+				}
+			}
+		}
+	}
+	return (n);
+}
diff --git a/fillit/src/legacy.c b/fillit/src/legacy.c
deleted file mode 100644
index 9ac49f6d..00000000
--- a/fillit/src/legacy.c
+++ /dev/null
@@ -1,110 +0,0 @@
-/*
-void	ft_grow_board(char **board)
-{
-	int	i;
-	int	size;
-
-	size = ft_strlen(*board);
-	i = 0;
-	while (++i <= size)
-	{
-		board[i][size] = '.';
-		board[size][i] = '.';
-	}
-}
-
-void	ft_shrink_board(char **board)
-{
-	int	i;
-	int	size;
-
-	size = ft_strlen(*board);
-	i = -1;
-	while (++i < size)
-	{
-		board[i][size - 1] = '\0';
-		board[size - 1][i] = '\0';
-	}
-}
-
-int		ft_test_fit(char **board, t_ttmn block, int i, int j)
-{
-	size_t	k;
-	int		new_size;
-	int		size;
-	int		x;
-	int		y;
-
-	size = ft_strlen(*board);
-	new_size = size;
-	k = -1;
-	while (++k < 4)
-	{
-		x = (int)j + block.pos[k][1];
-		y = (int)i + block.pos[k][0];
-		if (x < 0 || x < 0)
-			return (0);
-		if (x > size - 1 || y > size - 1)
-		{
-			new_size = MAX(new_size, MAX(x + 1, y + 1));
-			continue ;
-		}
-		if (board[y][x] != '.' && board[y][x] != '*')
-			return (0);
-	}
-	return (0);
-}
-
-*/
-
-/* int		ft_check_blobs(char **board, t_list **amap, t_list *lblob, t_list *lttmn, int space) */
-/* { */
-/* 	t_list	*blob; */
-/* 	t_list	*new_map; */
-/* 	int		size; */
-
-/* 	if (!lttmn) */
-/* 		return (ft_solved(board)); */
-/* 	if (((t_ttmn *)lttmn->content)->placed) */
-/* 		return (ft_check_blobs(board, amap, lblob, lttmn->next, space)); */
-/* 	fflush(stdout); */
-/* 	if (!lblob) */
-/* 	{ */
-/* 		return (ft_solver(board, amap, lttmn, space)); */
-/* 	} */
-/* 	size = ft_strlen(*board); */
-/* 	blob = *(t_list **)lblob->content; */
-
-/* 	if (ft_lstsize(blob) / 4 == 1) */
-/* 	{ */
-/* 		/1* new_map = ft_lstmap(*amap, &ft_id); *1/ */
-/* 		if (ft_fit_blob(board, amap, lblob, lttmn, space)) */
-/* 		{ */
-/* 			lblob = lblob->next; */
-/* 			return (1); */
-/* 		} */
-/* 		else */
-/* 		{ */
-/* 			space -= 4; */
-/* 			/1* printf("took off 4 from space : %i (fit)\n", space); *1/ */
-/* 			/1* fflush(stdout); *1/ */
-/* 			if (space < 0) */
-/* 			{ */
-/* 				/1* ft_show_board(board); *1/ */
-/* 				/1* ft_putendl("not enough space"); *1/ */
-/* 				return (0); */
-/* 			} */
-/* 		} */
-/* 	} */
-/* 	else */
-/* 	{ */
-/* 		/1* ft_lst_print(*amap, &ft_putnbr); *1/ */
-/* 		/1* printf("blob too big, adding to map\n"); *1/ */
-/* 		/1* fflush(stdout); *1/ */
-/* 		/1* ft_lst_print(*amap, &ft_putnbr); *1/ */
-
-/* 		ft_lst_sorted_merge(amap, blob, &ft_diff); */
-/* 	} */
-/* 	new_map = ft_lstmap(*amap, &ft_id); */
-/* 	return(ft_check_blobs(board, &new_map, lblob->next, lttmn, space)); */
-/* } */
diff --git a/fillit/src/board_lib.c b/fillit/src/lib_board.c
similarity index 100%
rename from fillit/src/board_lib.c
rename to fillit/src/lib_board.c
diff --git a/fillit/src/ttmn_lib.c b/fillit/src/lib_ttmn.c
similarity index 100%
rename from fillit/src/ttmn_lib.c
rename to fillit/src/lib_ttmn.c
diff --git a/fillit/examples/ok_12_blocks b/fillit/tests/examples/12_hard
similarity index 100%
rename from fillit/examples/ok_12_blocks
rename to fillit/tests/examples/12_hard
diff --git a/fillit/examples/bad_ttmn_00 b/fillit/tests/examples/bad_ttmn_00
similarity index 100%
rename from fillit/examples/bad_ttmn_00
rename to fillit/tests/examples/bad_ttmn_00
diff --git a/fillit/examples/bad_ttmn_01 b/fillit/tests/examples/bad_ttmn_01
similarity index 100%
rename from fillit/examples/bad_ttmn_01
rename to fillit/tests/examples/bad_ttmn_01
diff --git a/fillit/examples/bad_ttmn_02 b/fillit/tests/examples/bad_ttmn_02
similarity index 100%
rename from fillit/examples/bad_ttmn_02
rename to fillit/tests/examples/bad_ttmn_02
diff --git a/fillit/examples/bad_ttmn_03 b/fillit/tests/examples/bad_ttmn_03
similarity index 100%
rename from fillit/examples/bad_ttmn_03
rename to fillit/tests/examples/bad_ttmn_03
diff --git a/fillit/examples/bad_ttmn_04 b/fillit/tests/examples/bad_ttmn_04
similarity index 100%
rename from fillit/examples/bad_ttmn_04
rename to fillit/tests/examples/bad_ttmn_04
diff --git a/fillit/examples/bad_ttmn_05 b/fillit/tests/examples/bad_ttmn_05
similarity index 100%
rename from fillit/examples/bad_ttmn_05
rename to fillit/tests/examples/bad_ttmn_05
diff --git a/fillit/examples/bad_ttmn_06 b/fillit/tests/examples/bad_ttmn_06
similarity index 100%
rename from fillit/examples/bad_ttmn_06
rename to fillit/tests/examples/bad_ttmn_06
diff --git a/fillit/examples/bad_ttmn_07 b/fillit/tests/examples/bad_ttmn_07
similarity index 100%
rename from fillit/examples/bad_ttmn_07
rename to fillit/tests/examples/bad_ttmn_07
diff --git a/fillit/examples/bad_ttmn_08 b/fillit/tests/examples/bad_ttmn_08
similarity index 100%
rename from fillit/examples/bad_ttmn_08
rename to fillit/tests/examples/bad_ttmn_08
diff --git a/fillit/examples/good_ttmn_00 b/fillit/tests/examples/good_ttmn_00
similarity index 100%
rename from fillit/examples/good_ttmn_00
rename to fillit/tests/examples/good_ttmn_00
diff --git a/fillit/examples/good_ttmn_01 b/fillit/tests/examples/good_ttmn_01
similarity index 100%
rename from fillit/examples/good_ttmn_01
rename to fillit/tests/examples/good_ttmn_01
diff --git a/fillit/examples/good_ttmn_02 b/fillit/tests/examples/good_ttmn_02
similarity index 100%
rename from fillit/examples/good_ttmn_02
rename to fillit/tests/examples/good_ttmn_02
diff --git a/fillit/examples/good_ttmn_03 b/fillit/tests/examples/good_ttmn_03
similarity index 100%
rename from fillit/examples/good_ttmn_03
rename to fillit/tests/examples/good_ttmn_03
diff --git a/fillit/examples/ko_00 b/fillit/tests/examples/ko_00
similarity index 100%
rename from fillit/examples/ko_00
rename to fillit/tests/examples/ko_00
diff --git a/fillit/examples/ko_01 b/fillit/tests/examples/ko_01
similarity index 100%
rename from fillit/examples/ko_01
rename to fillit/tests/examples/ko_01
diff --git a/fillit/examples/ok_00 b/fillit/tests/examples/ok_00
similarity index 100%
rename from fillit/examples/ok_00
rename to fillit/tests/examples/ok_00
diff --git a/fillit/examples/ok_01 b/fillit/tests/examples/ok_01
similarity index 100%
rename from fillit/examples/ok_01
rename to fillit/tests/examples/ok_01
diff --git a/fillit/examples/ok_02 b/fillit/tests/examples/ok_02
similarity index 100%
rename from fillit/examples/ok_02
rename to fillit/tests/examples/ok_02
diff --git a/fillit/examples/ok_03 b/fillit/tests/examples/ok_03
similarity index 100%
rename from fillit/examples/ok_03
rename to fillit/tests/examples/ok_03
diff --git a/fillit/examples/ok_09_block b/fillit/tests/examples/ok_09_block
similarity index 100%
rename from fillit/examples/ok_09_block
rename to fillit/tests/examples/ok_09_block
diff --git a/fillit/examples/ok_11_blocks b/fillit/tests/examples/ok_11_blocks
similarity index 100%
rename from fillit/examples/ok_11_blocks
rename to fillit/tests/examples/ok_11_blocks
diff --git a/fillit/examples/ok_13_blocks b/fillit/tests/examples/ok_13_blocks
similarity index 100%
rename from fillit/examples/ok_13_blocks
rename to fillit/tests/examples/ok_13_blocks
diff --git a/fillit/examples/ok_25_blocks b/fillit/tests/examples/ok_25_blocks
similarity index 100%
rename from fillit/examples/ok_25_blocks
rename to fillit/tests/examples/ok_25_blocks
diff --git a/fillit/examples/ok_26_blocks b/fillit/tests/examples/ok_26_blocks
similarity index 100%
rename from fillit/examples/ok_26_blocks
rename to fillit/tests/examples/ok_26_blocks
diff --git a/fillit/tests/fillit_test.sh b/fillit/tests/fillit_test.sh
new file mode 100755
index 00000000..e3cddf8d
--- /dev/null
+++ b/fillit/tests/fillit_test.sh
@@ -0,0 +1,2 @@
+./random_tetriminos.py $1
+time ../fillit ttmnfile
diff --git a/fillit/tests/random_tetriminos.py b/fillit/tests/random_tetriminos.py
new file mode 100755
index 00000000..a72e3759
--- /dev/null
+++ b/fillit/tests/random_tetriminos.py
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+from __future__ import print_function
+import sys, random, os
+
+if (len(sys.argv) != 2):
+    print("Please provide one argument.")
+    sys.exit()
+print ("Generating file with %s random tetriminos: " % sys.argv[1], end="")
+os.chdir('tetriminos')
+ttmns = os.listdir('.')
+n_ttmns = len(ttmns)
+rand_ind = [random.randrange(0, n_ttmns - 1) for _ in range(int(sys.argv[1]))]
+# for i in indexes:
+#     print(ttmns[i].rstrip(), end="")
+rand_ttmns = [ttmns[i].rstrip() for i in rand_ind]
+print(', '.join(rand_ttmns))
+command = "cat "+' '.join(rand_ttmns)+" | awk '1; NR % 4 == 0 {print \"\"}' | sed '$ d' > ../ttmnfile"
+# print(command)
+os.system(command)
diff --git a/fillit/tests/tetriminos/I b/fillit/tests/tetriminos/I
new file mode 100644
index 00000000..caa819e1
--- /dev/null
+++ b/fillit/tests/tetriminos/I
@@ -0,0 +1,4 @@
+#...
+#...
+#...
+#...
diff --git a/fillit/tests/tetriminos/I2 b/fillit/tests/tetriminos/I2
new file mode 100644
index 00000000..53ba7c36
--- /dev/null
+++ b/fillit/tests/tetriminos/I2
@@ -0,0 +1,4 @@
+####
+....
+....
+....
diff --git a/fillit/tests/tetriminos/J b/fillit/tests/tetriminos/J
new file mode 100644
index 00000000..5312f7aa
--- /dev/null
+++ b/fillit/tests/tetriminos/J
@@ -0,0 +1,4 @@
+.#..
+.#..
+##..
+....
diff --git a/fillit/tests/tetriminos/J1 b/fillit/tests/tetriminos/J1
new file mode 100644
index 00000000..ad5b014f
--- /dev/null
+++ b/fillit/tests/tetriminos/J1
@@ -0,0 +1,4 @@
+###.
+..#.
+....
+....
diff --git a/fillit/tests/tetriminos/J2 b/fillit/tests/tetriminos/J2
new file mode 100644
index 00000000..62a57892
--- /dev/null
+++ b/fillit/tests/tetriminos/J2
@@ -0,0 +1,4 @@
+##..
+#...
+#...
+....
diff --git a/fillit/tests/tetriminos/J3 b/fillit/tests/tetriminos/J3
new file mode 100644
index 00000000..0e8a3bd9
--- /dev/null
+++ b/fillit/tests/tetriminos/J3
@@ -0,0 +1,4 @@
+#...
+###.
+....
+....
diff --git a/fillit/tests/tetriminos/L b/fillit/tests/tetriminos/L
new file mode 100644
index 00000000..501ac2f2
--- /dev/null
+++ b/fillit/tests/tetriminos/L
@@ -0,0 +1,4 @@
+#...
+#...
+##..
+....
diff --git a/fillit/tests/tetriminos/L1 b/fillit/tests/tetriminos/L1
new file mode 100644
index 00000000..2f3b939d
--- /dev/null
+++ b/fillit/tests/tetriminos/L1
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..8eb38d7f
--- /dev/null
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@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..46e8c2cb
--- /dev/null
+++ b/fillit/tests/tetriminos/L3
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..6621462e
--- /dev/null
+++ b/fillit/tests/tetriminos/O
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..0d3244d5
--- /dev/null
+++ b/fillit/tests/tetriminos/S
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new file mode 100644
index 00000000..d0015489
--- /dev/null
+++ b/fillit/tests/tetriminos/S1
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..59b033c7
--- /dev/null
+++ b/fillit/tests/tetriminos/T
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new file mode 100644
index 00000000..404ff0e9
--- /dev/null
+++ b/fillit/tests/tetriminos/T1
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..9453c20b
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+++ b/fillit/tests/tetriminos/T2
@@ -0,0 +1,4 @@
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new file mode 100644
index 00000000..29df265c
--- /dev/null
+++ b/fillit/tests/tetriminos/T3
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new file mode 100644
index 00000000..f355218f
--- /dev/null
+++ b/fillit/tests/tetriminos/Z
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new file mode 100644
index 00000000..e7f9087e
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new file mode 100644
index 00000000..6a503f47
--- /dev/null
+++ b/fillit/tests/ttmnfile
@@ -0,0 +1,74 @@
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index 00000000..e69de29b