diff --git a/day24/input b/day24/input
new file mode 100644
index 0000000..e867e27
--- /dev/null
+++ b/day24/input
@@ -0,0 +1,22 @@
+#.######################################################################################################################################################
+#.v><><<>^^^<><<>.^v<>v^>v^v^^<..^v>^>^vv.>v^<<>^.v<vvv<.>><v>><^>><>^<><v<>>>><v>v<^<>^.v..v^vv<v<<vv.v>>v<>v.<..^<vv<^v^v.v>>v>><^v>^<.vv^^<<><<>v>><#
+#.vv<vv<>.v<<<<<>>vv<>^v^^<^<>><.<^>^<^>^<v<<<<v>v>><.><.^><>vv<^^><<<<>^<.<v^.vv^vv>v>^.<<<><v<.v.<><<v^^v>^^<^>>^.<v^v.v><<v^vv<<v>^v>><^^<^<v>^>><v<#
+#<v^>v^vv<><v><<^<>^<^vv>v>>^^><<<vv><v.v.^><<^><>v>^<^v<<^>v<vv><v<<^.vv^>>>.^v>v.><v>v<^<^^<><<>><<^^^>v<^>>^v>>vv.<>^<><<^v>><^.>v^v><<^^^^<v<>^v<v.#
+#<<^<vv^<^><>^><>^vv.v^v>><^^<>^<>>^><^.^^<.v...>^^.^<<v<vvv>>>v^..^v.v<^><>.>v^.vv<^^vv>vv^.^.vv<v>>^>v.^^^<v<>><vv^>>^^.v>.v^^<^>vvv^<<v^<v<^><^>v<>>#
+#<.<^>>^<v><^>^^.>>v^<v^vvv>>vv.v^<>^^>v<<vv^<>^v.<<<^>>>.^>vvv.^^^<^><<^><v>><^.^>vv^^vv.><<v<^<v^^^.>v>^>v.^^<<^^^>^><><<vv<.<>v>vv>><^^v>>vvv^<...<<#
+#><v.v>vv>^^^>>><v>^^v>^>>><vv^<^<^<<<>.<<.<.<..><><v.v^^.v..v^>>>^v><.^^><<>v^<^<>^>>.v^v.v.>v>^>>>v>>^>><^<.v.v<^<<<<<^^>^^^^>^^<v^>>v><>.<>v><>.>><>#
+#<><<.>^<>^^v<v>^><^>v^.>><vv^vv^<v<<>.>.>>.vv.v<.^<^<>>^><><^.v>>v^^v><>><<<vv<<>v><>^.>>^>v^^><^<v<<><vv^>>.<^<.^<^>vvv>^<.v<^<>.><.>>v<^>^v<<.^<v>^<#
+#<>.<v^>.^<<^v^.<<^>v^^vv<^><^<^>><v^^vvv<<vvvv>>^v><<>^>vvvvv^<<v^.>^<.<^>.^>^><v^<>>.<<^^vv>>>^>vv><vvv^v.>^vv><<<<>^v^^^.>.^>>^^v^v>v>vv^<<^vv^<>v<>#
+#<<>v>v>>v^^v><^<.vv<^>^^>.v^<.^^vv>.<>^<>v>^>vvv<vv^>v^><<<v>vv<..^v^v>v.v><^.<^>.v<v><v>v^>^<<<<<>^.v<^.<v.<<^>v^^^<^<<>v.<<^<<<<.<^><<<^<v<v>>v>.><>#
+#>>.>vvv<<..>^^vv^>.<.v..v^^>^v<<>>>vv.<v>vv^<vv^v><v^^.<<.><..><^><<>^<<><v<.<v.<^<^.^<^<<><><<^v^>.<<v^^>.^<...v.^<^^<><><>v^<><^>^>^v^.>^^>^.vv.<v^>#
+#>.<><v>v<v>v>^v^^v>.v^.v>v>.<>>>^vv<<v>>^>^.^<^vv.vvvv<<>v<^^.>v<^v<<^><^.^^v<>.v<vv><v<v>vvv>^^>v>..<<<v..>v..<^^^<v>^^<<vv<>>^^v^.vv<><^>>.^<<^>>v.>#
+#><v..vv^<v^<>>v<>..<^>v^^><.>vv^vv^<^^v<>vv<.vv^^<>^>>^v<^^<<>^vv>v><>v<^vvv^<>><>^^^v^<v.v^<<^^>>>>><^^>><^v>>vv^v><^>^<<^.v>vv>^.v^<vv^v>>>vv>v^v<^>#
+#...>><v.<v<>^.v.v..^>^<><vv^><<<vv^<vv.><^.vv>>><v^v^>^v>>v<.^<^^<v^<>v<^<><<<.^<<vv.<>>^v^^.v>.<v>^.^>v^.v><^<<>>>^.<<<^v<<<><^>.^.^v><>^>><vv<v.<.^>#
+#<^vv>>v>v<^><^^^<^>vv<>vv>^^^.><><^>v>><v.<>vv^^<^<<<v^<><v>v^v>^<><><><><>^^>><>..^^>v<...vv<^>><.vv<^<v><v<vv^.><>v^<>v.^>>>v<<^<<^vv.>^<.^<>^<v^^^>#
+#>>^vv^.<<.<.<>>vvv<<<..<v><^<>^><<>^.<<^^^<v^<<v.<vv<^<>>vv^>.v^v<^<>>vv<<^>>.v>.v>^^^vvv^v<^><v^><>><^<.>v^^^<vv^>^v<v^<vv><>..^><.>^^<^>>..^.v^<^<v>#
+#<<><^^><v^v<^^<vv>><v..>>>^><>>>v>v>v>v><>>^vv><>>v>>vvvv<<^><>v^>vv>^.>>v.^<v<^.>>>^^v>>><vvv>><.<v<^<v<^v<v<<vvv..^^<<^<.<><<<<^<>v<<<^^>.^v>^^v<^^<#
+#>v^^^<v>^^<v<<<vv><^v.v<v^^^vvv<<><><^^><^^>>>>>><^>^^.>vv>^><<<v<<<^vv.^^^<v>v<^^^^>.^^vv<^<.<v^<vv^^^>><..><^>v><<v>v>^v^>>^^>vv.v^^^>^^vv.<<v.^><<.#
+#<^v<<^^vvv.>v>v>.v><v<^^>^>^>^^v>v^vv^<.^.>>>>>v<>.<<.<^<<vvv..<^>^><^>^<^<<>><^>v<v^v>^v^^^>>>>v>^>>^<v..><.>>^^><^<^.<v^>^.v>^^vv^v.<>>>>.v.<<>^^vv>#
+#<v^v.>.>^v>^<v.<^<^>v^>^^.>.>v<>>>^>vv<>v<>^>v^<<^<.<<^>v^<><>><^^<^^v<>>vv<<.<>v>.>^^^>><^^<^vv.><v<.<<^^>^>><>v><^vv.>v^v^v..<vvv..<<v<v^<<v>^<^>><<#
+#<^v<v^^v^>^<>v^<^<>>..>><>v<.^<.>v.>^v.>>^^<^v>>v^.v>^><>>vv.<<<>v>^.>v>..<<<v.<v^<>^>^<>v<^<v<><^>^v><.<<^^^<^.<<<^.^v^^.>^.<<vv>^v><<>^<^v^^>^v><<^>#
+######################################################################################################################################################.#
diff --git a/day24/sample b/day24/sample
new file mode 100644
index 0000000..685dc4f
--- /dev/null
+++ b/day24/sample
@@ -0,0 +1,6 @@
+#.######
+#>>.<^<#
+#.<..<<#
+#>v.><>#
+#<^v^^>#
+######.#
diff --git a/day24/sol.py b/day24/sol.py
new file mode 100644
index 0000000..a77b05e
--- /dev/null
+++ b/day24/sol.py
@@ -0,0 +1,113 @@
+data = []
+for line in open("input"):
+    data.append(line.strip())
+
+import sys, os; sys.path.append(os.path.join(os.path.dirname(__file__), "../lib"))
+import astar
+
+
+#print(*data, sep="\n")
+
+blizzards = {'>': {}, '<': {}, '^': {}, 'v': {}}
+for y in range(len(data)):
+    for x in range(len(data[y])):
+        c = data[y][x]
+        if c in blizzards:
+            blizzards[c][x,y] = 1
+
+def show(t):
+    H = len(data)-2
+    for y in range(len(data)):
+        s = []
+        W = len(data[y])-2
+        for x in range(len(data[y])):
+            c = data[y][x]
+            if c == '#':
+                s.append(c)
+            else:
+                bliz = []
+                u = 1 + ((x - t)-1)%W
+                if (u,y) in blizzards['>']:
+                    bliz.append('>')
+
+                u = 1 + ((x + t)-1)%W
+                if (u,y) in blizzards['<']:
+                    bliz.append('<')
+
+                v = 1 + ((y - t)-1)%H
+                if (x,v) in blizzards['v']:
+                    bliz.append('v')
+
+                v = 1 + ((y + t)-1)%H
+                if (x,v) in blizzards['^']:
+                    bliz.append('^')
+
+                if len(bliz) == 0:
+                    s.append('.')
+                elif len(bliz) == 1:
+                    s.append(bliz[0])
+                elif len(bliz) < 10:
+                    s.append(str(len(bliz)))
+                else:
+                    s.append('*')
+            
+        print(''.join(s))
+
+def blocked(x,y,t):
+    H = len(data)-2
+    W = len(data[y])-2
+
+    if not 0 <= y < len(data):
+        return True
+    if not 0 <= x < len(data[y]):
+        return True
+    if data[y][x] == '#':
+        return True
+
+    u = 1 + ((x - t)-1)%W
+    if (u,y) in blizzards['>']:
+        return True
+
+    u = 1 + ((x + t)-1)%W
+    if (u,y) in blizzards['<']:
+        return True
+
+    v = 1 + ((y - t)-1)%H
+    if (x,v) in blizzards['v']:
+        return True
+
+    v = 1 + ((y + t)-1)%H
+    if (x,v) in blizzards['^']:
+        return True
+
+    return False
+
+start = (data[0].index('.'), 0, 0)
+goal = (data[-1].index('.'), len(data)-1)
+
+def is_goal(node):
+    x, y, t = node
+    return (x,y) == goal
+
+def heuristic(node):
+    x, y, t = node
+    return abs(goal[0] - x) + abs(goal[1] - y)
+
+def neighbors(node):
+    x, y, t = node
+    n = []
+    def check(dx,dy):
+        if not blocked(x+dx,y+dy,t+1):
+            n.append((1, (x+dx, y+dy, t+1)))
+    check(+1,0)
+    check(0,+1)
+    check(-1,0)
+    check(0,-1)
+    check(0,0)
+    return n
+
+show(0)
+show(1)
+#show((len(data)-2)*(len(data[0])-2))
+
+print(astar.search(start, is_goal, neighbors, heuristic))