diff --git a/2021/nine.nim b/2021/nine.nim
new file mode 100644
index 0000000..527ff41
--- /dev/null
+++ b/2021/nine.nim
@@ -0,0 +1,24 @@
+import ./common, std/[strutils, sequtils, strformat, sugar, sets, math]
+
+proc toGrid(s: seq[string]): seq[seq[int]] =
+  for l in s: result.add(l.mapIt(int(it)-int('0')))
+
+proc p1(c: seq[seq[int]]): int =
+  let h = c.len()
+  let w = c[0].len()
+  for y,l in c.pairs():
+    for x,n in l.pairs():
+      if x > 0 and c[y][x-1] <= n: continue
+      if y > 0 and c[y-1][x] <= n: continue
+      if x < w-1 and c[y][x+1] <= n: continue
+      if y < h-1 and c[y+1][x] <= n: continue
+      result += n + 1
+
+doDay(9, (n) => n.loadInput().toGrid(),
+  p1,
+  p1,
+  """2199943210
+3987894921
+9856789892
+8767896789
+9899965678""".split('\n').toGrid(), 15, 15)