diff --git a/2015/day07.py b/2015/day07.py
new file mode 100644
index 0000000..8f0130a
--- /dev/null
+++ b/2015/day07.py
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+#!/usr/bin/env python3
+
+from typing import TextIO
+import itertools
+
+circuit: dict[str, int] = {}
+
+
+class Continue(Exception):
+    pass
+
+
+def part1(instructions: TextIO) -> int:
+    ins: list[str] = []
+
+    # process all instructions into a list
+    for l in instructions:
+        ins.append(l.strip())
+
+    # repeat until the list is empty
+    while len(ins) != 0:
+        for connection in ins:
+            cpart = connection.split()
+            # print(cpart, sep="")
+            cpart.remove("->")
+
+            # Exclude the destination
+            try:
+                # possibles = list(itertools.filterfalse(str.isupper, cpart))[:-1]
+                for p in range(len(cpart) - 1):
+                    if not cpart[p].isnumeric() and not cpart[p].isupper():
+                        if cpart[p] in circuit:
+                            # Get the value?
+                            # This error can be ignored, lol
+                            cpart[p] = circuit[cpart[p]]
+                        else:
+                            # We can't do anything for this
+                            raise Continue
+            except Continue:
+                continue
+
+            # assignment
+            if len(cpart) == 2:
+                circuit[cpart[1]] = int(cpart[0])
+            elif "NOT" in cpart:
+                circuit[cpart[-1]] = (
+                    ~int(cpart[1]) & 0xFFFF
+                )  # see notes for why you can't just use ~
+            elif "AND" in cpart:
+                circuit[cpart[-1]] = int(cpart[0]) & int(cpart[2])
+            elif "OR" in cpart:
+                circuit[cpart[-1]] = int(cpart[0]) | int(cpart[2])
+            elif "LSHIFT" in cpart:
+                circuit[cpart[-1]] = int(cpart[0]) << int(cpart[2])
+            elif "RSHIFT" in cpart:
+                circuit[cpart[-1]] = int(cpart[0]) >> int(cpart[2])
+
+            ins.remove(connection)
+
+    # print(circuit)
+    return circuit["a"]
+
+
+def part2(f: TextIO):
+    circuit["b"] = circuit["a"]
+
+    for k in list(circuit.keys()):
+        if k != "b":
+            del circuit[k]
+
+    return part1(f)
+
+
+if __name__ == "__main__":
+    with open("day07.txt", "r") as f:
+        print(part1(f))
+
+    with open("day07.txt", "r") as f:
+        print(part2(f))
diff --git a/2015/day07.txt b/2015/day07.txt
new file mode 100644
index 0000000..7cb3187
Binary files /dev/null and b/2015/day07.txt differ
diff --git a/2015/day07_test.py b/2015/day07_test.py
new file mode 100644
index 0000000..b193175
--- /dev/null
+++ b/2015/day07_test.py
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+#!/usr/bin/env python3
+
+from day07 import *
+
+
+def test_part1() -> None:
+    with open("day07.txt", "r") as f:
+        assert part1(f) == 956
+
+
+def test_part2() -> None:
+    with open("day07.txt", "r") as f:
+        assert part2(f) == 40149