diff --git a/README.md b/README.md
index a47835f..75f9a22 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,13 @@
 # Times
 
-- Day 1: 7:52 ... so slow brah :/ top 100 required 2:05...
-- Day 2: 22:30 ... I mistyped the first and second was just bad top 100 would have been 6:16 (doable?)
-- Day 3: 13:08 actually decent but top 100 required 5:24
-- Day 4: 7:08 but top 100 required 3:33 still okay
-- Day 5: 11:56 but 7:58 for top 100... getting better?
-- Day 6: 3:50 but 2:25 for leaderboard :D
-- Day 7: 27:55 and 14:47 for leaderboard; okay, I would say
-- Day 8: 61:00 and 10:00 for leaderboard; I need template code for searching coordinate systems
-- Day 9: 58:00 and 7:32 for leaderboard; I need code for 2D stuff
-- Day 10:
+- Day  1: 7:52 ... so slow brah :/ top 100 required 2:05...
+- Day  2: 22:30 ... I mistyped the first and second was just bad top 100 would have been 6:16 (doable?)
+- Day  3: 13:08 actually decent but top 100 required 5:24
+- Day  4: 7:08 but top 100 required 3:33 still okay
+- Day  5: 11:56 but 7:58 for top 100... getting better?
+- Day  6: 3:50 but 2:25 for leaderboard :D
+- Day  7: 27:55 and 14:47 for leaderboard; okay, I would say
+- Day  8: 61:00 and 10:00 for leaderboard; I need template code for searching coordinate systems
+- Day  9: 58:00 and 7:32 for leaderboard; I need code for 2D stuff
+- Day 10: 25:20 and 12:17 for leaderboard; okay, okay
+- Day 11:
diff --git a/d10.py b/d10.py
new file mode 100644
index 0000000..d64896e
--- /dev/null
+++ b/d10.py
@@ -0,0 +1,216 @@
+import re
+from string import ascii_lowercase, ascii_uppercase
+
+EXAMPLE = """
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop
+"""
+
+def clean(text: str) -> list[str]:
+    return list(filter(lambda l: l.strip() != "", text.splitlines()))
+
+def solve(lines: list[str]):
+    res = 0
+    inst_count = 0
+    value_x = 1
+    cycles = [20, 60, 100, 140, 180, 220]
+    for i, line in enumerate(lines):
+        inst_count_before = inst_count
+        addx = 0
+        if line.startswith("noop"):
+            inst_count += 1
+        elif line.startswith("addx"):
+            v = int(line.split()[1])
+            value_x += v
+            inst_count += 2
+            addx = v
+        else:
+            raise Exception("Unexpected {line}")
+
+        for c in cycles:
+            if inst_count_before < c and inst_count >= c:
+                strength = (value_x - addx) * c
+                res += strength
+                print(inst_count, strength)
+    # 15:10
+    return res
+
+def solve2(lines: list[str]):
+    x_values = [1]
+    for _, line in enumerate(lines):
+        if line.startswith("noop"):
+            x_values.append(x_values[-1])
+        elif line.startswith("addx"):
+            x_values.append(x_values[-1])
+            v = int(line.split()[1])
+            x_values.append(x_values[-1] + v)
+
+    s = ""
+    for i, x in enumerate(x_values):
+        col = i % 40
+        if col == 0:
+            s += "\n"
+        if col == x - 1 or col == x or col == x + 1:
+            s += "#"
+        else:
+            s += " "
+    print(s)
+    # 25:20
+
+
+def main():
+    example = clean(EXAMPLE)
+    print("Example  1:", solve(example))
+
+    data = clean(open("i10.txt").read())
+    print("Solution 1:", solve(data))
+
+    data = clean(open("i10.txt").read())
+    print("Solution 2:", solve2(data))
+
+if __name__ == "__main__":
+    main()
diff --git a/i10.txt b/i10.txt
new file mode 100644
index 0000000..6402c1a
--- /dev/null
+++ b/i10.txt
@@ -0,0 +1,145 @@
+noop
+noop
+noop
+addx 3
+addx 7
+noop
+noop
+noop
+noop
+addx 6
+noop
+addx -1
+noop
+addx 5
+addx 1
+noop
+addx 4
+noop
+noop
+noop
+noop
+addx 6
+addx -1
+noop
+addx 3
+addx -13
+addx -22
+noop
+noop
+addx 3
+addx 2
+addx 11
+addx -4
+addx 11
+addx -10
+addx 2
+addx 5
+addx 2
+addx -2
+noop
+addx 7
+addx 3
+addx -2
+addx 2
+addx 5
+addx 2
+addx -2
+addx -8
+addx -27
+addx 5
+addx 2
+addx 21
+addx -21
+addx 3
+addx 5
+addx 2
+addx -3
+addx 4
+addx 3
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+addx 3
+addx 1
+addx 6
+addx -31
+noop
+addx -4
+noop
+noop
+noop
+noop
+addx 3
+addx 7
+noop
+addx -1
+addx 1
+addx 5
+noop
+addx 1
+noop
+addx 2
+addx -8
+addx 15
+addx 3
+noop
+addx 2
+addx 5
+noop
+noop
+noop
+addx -28
+addx 11
+addx -20
+noop
+addx 7
+addx -2
+addx 7
+noop
+addx -2
+noop
+addx -6
+addx 11
+noop
+addx 3
+addx 2
+noop
+noop
+addx 7
+addx 3
+addx -2
+addx 2
+addx 5
+addx 2
+addx -16
+addx -10
+addx -11
+addx 27
+addx -20
+noop
+addx 2
+addx 3
+addx 5
+noop
+noop
+noop
+addx 3
+addx -2
+addx 2
+noop
+addx -14
+addx 21
+noop
+addx -6
+addx 12
+noop
+addx -21
+addx 24
+addx 2
+noop
+noop
+noop