diff --git a/23/input.txt b/23/input.txt
new file mode 100644
index 0000000..7703a02
--- /dev/null
+++ b/23/input.txt
@@ -0,0 +1 @@
+469217538
diff --git a/23/main.py b/23/main.py
new file mode 100644
index 0000000..3a9c2f2
--- /dev/null
+++ b/23/main.py
@@ -0,0 +1,60 @@
+
+def read_input(filename: str) -> list[int]:
+    with open(filename, "r") as f:
+        return list(int(c) for c in f.readline()[:-1])
+
+def take_cups(cups: list[int], start: int, length: int) -> list[int]:
+    taken_cups = []
+    index = start % len(cups)
+    for _ in range(length):
+        taken_cups.append(cups.pop(index))
+        index = index % len(cups)
+    return taken_cups
+
+def put_cups(cups: list[int], start: int, target: list[int]):
+    index = start
+    for value in target:
+        cups.insert(index, value)
+        index = index + 1
+
+def simulate(cups: list[int], moves: int):
+    max_value = max(cups)
+    min_value = min(cups)
+
+    current_cup_label = cups[0]
+    for _ in range(moves):
+        taken_cups = take_cups(cups, cups.index(current_cup_label)+1, 3)
+
+        destination_label = current_cup_label - 1
+        while destination_label not in cups:
+            destination_label -= 1
+            if destination_label < min_value:
+                destination_label = max_value
+        destination = cups.index(destination_label)
+
+        put_cups(cups, destination + 1, taken_cups)
+
+        current_cup_label = cups[(cups.index(current_cup_label) + 1) % len(cups)]
+
+def part1(cups: list[int]) -> str:
+    simulate(cups, 100)
+
+    num1_index = cups.index(1)
+    return "".join(map(str, cups[num1_index+1:])) + "".join(map(str, cups[:num1_index]))
+
+def part2(cups: list[int]) -> int:
+    for value in range(max(cups), 1_000_000 + 1):
+        cups.append(value)
+
+    simulate(cups, 1_00)
+    # simulate(cups, 10_000_000)
+
+    num1_index = cups.index(1)
+    star1 = cups[(num1_index + 1) % len(cups)]
+    star2 = cups[(num1_index + 2) % len(cups)]
+    return star1 * star2
+
+if __name__ == "__main__":
+    cups = read_input("test.txt")
+    print("part1: ", part1(cups.copy()))
+    print("part2: ", part2(cups.copy()))
diff --git a/23/test.txt b/23/test.txt
new file mode 100644
index 0000000..ab40847
--- /dev/null
+++ b/23/test.txt
@@ -0,0 +1 @@
+389125467