diff --git a/day20.py b/day20.py
new file mode 100644
index 0000000..c6e7378
--- /dev/null
+++ b/day20.py
@@ -0,0 +1,141 @@
+from tools.aoc import AOCDay
+from typing import Any
+
+
+class Node:
+    def __init__(self, node_id: int, value: int):
+        self.node_id = node_id
+        self.value = value
+        self.left = None
+        self.right = None
+        self.was_moved = False
+
+    def __str__(self):
+        return f"Node(id={self.node_id}; value={self.value}; moved={self.was_moved}; left={self.left.node_id}; right={self.right.node_id})"
+
+    def __len__(self):
+        ptr = self
+        length = 0
+        while ptr.right != self:
+            length += 1
+            ptr = ptr.right
+
+        return length + 1
+
+
+def llistprint(llist: Node) -> None:
+    ptr = llist
+    print("[", end="")
+    while ptr.right != llist:
+        print(f"{ptr.value}, ", end="")
+        ptr = ptr.right
+    print(f"{ptr.value}]")
+
+
+def mix(head: Node) -> Node:
+    ptr = head
+    list_len = len(head)
+    for i in range(list_len):
+        cur_val = ptr.value
+        cur_ptr = ptr
+        cur_ptr.was_moved = True
+
+        ptr = ptr.right
+        while ptr.was_moved and i < list_len - 1:
+            ptr = ptr.right
+
+        if cur_val == 0:
+            continue
+
+        if cur_ptr == head:
+            head = cur_ptr.right
+
+        cur_ptr.left.right = cur_ptr.right
+        cur_ptr.right.left = cur_ptr.left
+
+        target_ptr = cur_ptr
+        if cur_val > 0:
+            cur_val = cur_val % list_len + cur_val // list_len
+        else:
+            cur_val = -(abs(cur_val) % list_len + abs(cur_val) // list_len)
+
+        for _ in range(abs(cur_val)):
+            if cur_val < 0:
+                target_ptr = target_ptr.left
+            else:
+                target_ptr = target_ptr.right
+
+        if cur_val < 0:
+            cur_ptr.left = target_ptr.left
+            cur_ptr.right = target_ptr
+            target_ptr.left.right = cur_ptr
+            target_ptr.left = cur_ptr
+        else:
+            cur_ptr.left = target_ptr
+            cur_ptr.right = target_ptr.right
+            target_ptr.right.left = cur_ptr
+            target_ptr.right = cur_ptr
+
+    return head
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (3, "input20_test"),
+            (4, "input20_test2"),
+            (10763, "input20"),
+        ],
+        [
+            (1623178306, "input20_test"),
+            (None, "input20"),
+        ]
+    ]
+
+    def get_inp_llist(self, mul: int = 1) -> Node:
+        head = None
+        tail = None
+        for i, x in enumerate(self.getInput(int)):
+            n = Node(i, x * mul)
+            if head is None:
+                head = n
+                tail = n
+            else:
+                tail.right = n
+                n.left = tail
+                tail = n
+
+        tail.right = head
+        head.left = tail
+
+        return head
+
+    def part1(self) -> Any:
+        ptr = self.get_inp_llist()
+        ptr = mix(ptr)
+
+        while ptr.value != 0:
+            ptr = ptr.right
+
+        val_sum = 0
+        for _ in range(3):
+            for _ in range(1000):
+                ptr = ptr.right
+            val_sum += ptr.value
+
+        return val_sum
+
+    def part2(self) -> Any:
+        key = 811589153
+        ptr = self.get_inp_llist(key)
+        for _ in range(10):
+            llistprint(ptr)
+            ptr = mix(ptr)
+
+        llistprint(ptr)
+
+        return ""
+
+
+if __name__ == '__main__':
+    day = Day(2022, 20)
+    day.run(verbose=True)
\ No newline at end of file
diff --git a/inputs/input20 b/inputs/input20
new file mode 100644
index 0000000..31e7e82
--- /dev/null
+++ b/inputs/input20
@@ -0,0 +1,5000 @@
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diff --git a/inputs/input20_test b/inputs/input20_test
new file mode 100644
index 0000000..5cbf3d9
--- /dev/null
+++ b/inputs/input20_test
@@ -0,0 +1,7 @@
+1
+2
+-3
+3
+-2
+0
+4
\ No newline at end of file
diff --git a/inputs/input20_test2 b/inputs/input20_test2
new file mode 100644
index 0000000..a8520b0
--- /dev/null
+++ b/inputs/input20_test2
@@ -0,0 +1,3 @@
+3
+1
+0
\ No newline at end of file