diff --git a/src/main/kotlin/no/rodland/advent_2023/Day20.kt b/src/main/kotlin/no/rodland/advent_2023/Day20.kt
new file mode 100644
index 00000000..1f438aac
--- /dev/null
+++ b/src/main/kotlin/no/rodland/advent_2023/Day20.kt
@@ -0,0 +1,27 @@
+package no.rodland.advent_2023
+
+import no.rodland.advent.Day
+
+// template generated: 20/12/2023
+// Fredrik Rødland 2023
+
+class Day20(val input: List<String>) : Day<Long, Long, List<String>> {
+
+    private val parsed = input.parse()
+
+    override fun partOne(): Long {
+        return 2
+    }
+
+    override fun partTwo(): Long {
+        return 2
+    }
+
+    override fun List<String>.parse(): List<String> {
+        return map { line ->
+            line
+        }
+    }
+
+    override val day = "20".toInt()
+}
diff --git a/src/test/kotlin/no/rodland/advent_2023/Day20Test.kt b/src/test/kotlin/no/rodland/advent_2023/Day20Test.kt
new file mode 100644
index 00000000..cac94801
--- /dev/null
+++ b/src/test/kotlin/no/rodland/advent_2023/Day20Test.kt
@@ -0,0 +1,88 @@
+package no.rodland.advent_2023
+
+import no.rodland.advent.*
+import org.junit.jupiter.api.Nested
+import org.junit.jupiter.api.Test
+import readFile
+
+//
+//  run: download_aoc_input.sh to download input
+//
+
+@Suppress("ClassName", "PrivatePropertyName")
+@DisableSlow
+internal class Day20Test {
+    private val data20 = "2023/input_20.txt".readFile()
+    private val test20 = "2023/input_20_test.txt".readFile()
+    private val test20_2 = "2023/input_20_test_2.txt".readFile()
+
+    private val resultTestOne = 2L
+    private val resultTestTwo = 2L
+    private val resultTestTwo_2 = 2L
+    private val resultOne = 2L
+    private val resultTwo = 2L
+
+    val test = defaultTestSuiteParseOnInit(
+        Day20(data20),
+        Day20(test20),
+        resultTestOne,
+        resultOne,
+        resultTestTwo,
+        resultTwo,
+        { Day20(data20) },
+        { Day20(test20) },
+    )
+
+    @Nested
+    inner class Init {
+        @Test
+        fun `20,-,example,1`() {
+            report(AOCTest({ "123".toInt() }, Unit, 123, 5, "20".toInt(), Part.TWO, false, "example"))
+        }
+
+        @Test
+        fun `20,-,example,2`() {
+            report(test.initTest.copy())
+        }
+
+        @Test
+        fun `20,-,test,init`() {
+            report(test.initTest)
+        }
+
+        @Test
+        fun `20,-,live,init`() {
+            report(test.initLive)
+        }
+    }
+
+    @Nested
+    inner class `Part 1` {
+        @Test
+        fun `20,1,test`() {
+            report(test.testPart1)
+        }
+        @Test
+        fun `20,1,test,2`() {
+            report(test.testPart1.copy(function = { Day20(test20_2).partOne() }, expected = resultTestTwo_2))
+        }
+
+        @Test
+        fun `20,1,live,1`() {
+            report(test.livePart1)
+        }
+    }
+
+    @Nested
+    inner class `Part 2` {
+        @Test
+        fun `20,2,test`() {
+            report(test.testPart2)
+        }
+
+        @Test
+        fun `20,2,live,1`() {
+            report(test.livePart2)
+        }
+    }
+}
diff --git a/src/test/resources/2023/input_20_test.txt b/src/test/resources/2023/input_20_test.txt
index e69de29b..9ed10ddd 100644
--- a/src/test/resources/2023/input_20_test.txt
+++ b/src/test/resources/2023/input_20_test.txt
@@ -0,0 +1,5 @@
+broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a
\ No newline at end of file
diff --git a/src/test/resources/2023/input_20_test_2.txt b/src/test/resources/2023/input_20_test_2.txt
new file mode 100644
index 00000000..2738ceb9
--- /dev/null
+++ b/src/test/resources/2023/input_20_test_2.txt
@@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output