diff --git a/bzip2/compress/rule.bzl b/bzip2/compress/rule.bzl
index f14fef7fbde636f43635c60d7bc6bd106d6472aa..06a00ee1e4168d17a41472c5832b2a2e36061b7c 100644
--- a/bzip2/compress/rule.bzl
+++ b/bzip2/compress/rule.bzl
@@ -6,6 +6,7 @@ DOC = """Compresses a file with the Burrows-Wheeler (`bzip2`) algorithm.
 bzip2_compress(
     name = "compress",
     src = "some/file.txt",
+    level = 1-9,
 )
 ```
 """
@@ -16,6 +17,12 @@ ATTRS = {
         mandatory = True,
         allow_single_file = True,
     ),
+    "level": attr.int(
+        doc = "The compression level.",
+        mandatory = False,
+        default = 5,
+        values = [l for l in range(1, 10)],
+    ),
     "_template": attr.label(
         default = "@rules_coreutils//coreutils/redirect:stdout",
         allow_single_file = True,
@@ -40,6 +47,7 @@ def implementation(ctx):
     args = ctx.actions.args()
     args.add(bzip2.executable.path)
     args.add("-czfk").add(ctx.file.src)
+    args.add("-{}".format(ctx.attr.level))
 
     ctx.actions.run(
         outputs = [output],
diff --git a/e2e/MODULE.bazel.lock b/e2e/MODULE.bazel.lock
index 8ac1745d1c66bca10d41c268d6c7bb4439bfd3ce..f76337279c35bc639882e39f78d1c4ee0dc83309 100644
--- a/e2e/MODULE.bazel.lock
+++ b/e2e/MODULE.bazel.lock
@@ -10714,7 +10714,7 @@
   "moduleExtensions": {
     "@@ape~1.0.0-beta.6//:MODULE.bazel%_repo_rules": {
       "general": {
-        "bzlTransitiveDigest": "7dmOqqm4azSAaOhBklUWLfQ6Db4qFiDpOgYBZF3yvig=",
+        "bzlTransitiveDigest": "WUdXC90lZZSXHYtKyCMn3+hL9HDr0CmF+mN296XUkf4=",
         "accumulatedFileDigests": {},
         "envVariables": {},
         "generatedRepoSpecs": {
diff --git a/e2e/bzip2/level/BUILD.bazel b/e2e/bzip2/level/BUILD.bazel
new file mode 100644
index 0000000000000000000000000000000000000000..8e2a57c2d0608df91fae7e6b446716f34083e9a4
--- /dev/null
+++ b/e2e/bzip2/level/BUILD.bazel
@@ -0,0 +1,21 @@
+load("@rules_bzip2//bzip2/compress:defs.bzl", "bzip2_compress")
+load("@rules_bzip2//bzip2/decompress:defs.bzl", "bzip2_decompress")
+load("@rules_diff//diff/file/test:defs.bzl", "diff_file_test")
+
+bzip2_compress(
+    name = "compress",
+    src = "//fixture:hello-world.txt",
+    level = 1,
+)
+
+bzip2_decompress(
+    name = "decompress",
+    src = ":compress",
+)
+
+diff_file_test(
+    name = "bzip2",
+    size = "small",
+    a = "//fixture:hello-world.txt",
+    b = ":decompress",
+)