diff --git a/lib/koans/03_sigils.ex b/lib/koans/03_sigils.ex
new file mode 100644
index 0000000..deef195
--- /dev/null
+++ b/lib/koans/03_sigils.ex
@@ -0,0 +1,39 @@
+defmodule Sigils do
+  use Koans
+
+  @intro "Sigils"
+
+  koan "The ~s sigil is a different way of expressing string literals" do
+    assert ~s{This is a string} == ___
+  end
+
+  koan "Sigils are useful to avoid escaping quotes in strings" do
+    assert "\"Welcome to the jungle\", they said." == ___
+  end
+
+  koan "Sigils can use different delimiters" do
+    matches? = ~s{This works!} == ~s[This works!]
+    assert matches? == ___
+  end
+
+  koan "The lowercase ~s sigil supports string interpolation" do
+    assert ~s[1 + 1 = #{1+1}] == ___
+  end
+
+  koan "The ~S sigil is similar to ~s but doesn't do interpolation" do
+    assert ~S[1 + 1 = #{1+1}] == ___
+  end
+
+  koan "The ~w sigil creates word lists" do
+    assert ~w(Hello world) == ___
+  end
+
+  koan "The ~w sigil also allows interpolation" do
+    assert ~w(Hello 1#{1+1}3) == ___
+  end
+
+  koan "The ~W sigil behaves to ~w as ~S behaves to ~s" do
+    assert ~W(Hello #{1+1}) == ___
+  end
+end
+
diff --git a/lib/koans/03_atoms.ex b/lib/koans/04_atoms.ex
similarity index 100%
rename from lib/koans/03_atoms.ex
rename to lib/koans/04_atoms.ex
diff --git a/lib/koans/04_tuples.ex b/lib/koans/05_tuples.ex
similarity index 100%
rename from lib/koans/04_tuples.ex
rename to lib/koans/05_tuples.ex
diff --git a/lib/koans/05_lists.ex b/lib/koans/06_lists.ex
similarity index 100%
rename from lib/koans/05_lists.ex
rename to lib/koans/06_lists.ex
diff --git a/lib/koans/06_keyword_lists.ex b/lib/koans/07_keyword_lists.ex
similarity index 100%
rename from lib/koans/06_keyword_lists.ex
rename to lib/koans/07_keyword_lists.ex
diff --git a/lib/koans/07_maps.ex b/lib/koans/08_maps.ex
similarity index 100%
rename from lib/koans/07_maps.ex
rename to lib/koans/08_maps.ex
diff --git a/lib/koans/08_structs.ex b/lib/koans/09_structs.ex
similarity index 100%
rename from lib/koans/08_structs.ex
rename to lib/koans/09_structs.ex
diff --git a/lib/koans/09_pattern_matching.ex b/lib/koans/10_pattern_matching.ex
similarity index 100%
rename from lib/koans/09_pattern_matching.ex
rename to lib/koans/10_pattern_matching.ex
diff --git a/lib/koans/10_functions.ex b/lib/koans/11_functions.ex
similarity index 100%
rename from lib/koans/10_functions.ex
rename to lib/koans/11_functions.ex
diff --git a/lib/koans/11_enums.ex b/lib/koans/12_enums.ex
similarity index 100%
rename from lib/koans/11_enums.ex
rename to lib/koans/12_enums.ex
diff --git a/lib/koans/12_processes.ex b/lib/koans/13_processes.ex
similarity index 100%
rename from lib/koans/12_processes.ex
rename to lib/koans/13_processes.ex
diff --git a/lib/koans/13_tasks.ex b/lib/koans/14_tasks.ex
similarity index 100%
rename from lib/koans/13_tasks.ex
rename to lib/koans/14_tasks.ex
diff --git a/lib/koans/14_agents.ex b/lib/koans/15_agents.ex
similarity index 100%
rename from lib/koans/14_agents.ex
rename to lib/koans/15_agents.ex
diff --git a/test/koans/sigils_koans_test.exs b/test/koans/sigils_koans_test.exs
new file mode 100644
index 0000000..096fff2
--- /dev/null
+++ b/test/koans/sigils_koans_test.exs
@@ -0,0 +1,19 @@
+defmodule SigilsTests do
+  use ExUnit.Case
+  import TestHarness
+
+  test "Sigils" do
+    answers = [
+      "This is a string",
+      ~S("Welcome to the jungle", they said.),
+      true,
+      "1 + 1 = 2",
+      ~S(1 + 1 = #{1+1}),
+      ["Hello", "world"],
+      ["Hello", "123"],
+      ["Hello", ~S(#{1+1})],
+    ]
+
+    test_all(Sigils, answers)
+  end
+end