diff --git a/judge/migrations/0129_auto_20220622_1424.py b/judge/migrations/0129_auto_20220622_1424.py
new file mode 100644
index 0000000..601bb85
--- /dev/null
+++ b/judge/migrations/0129_auto_20220622_1424.py
@@ -0,0 +1,23 @@
+# Generated by Django 2.2.25 on 2022-06-22 07:24
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('judge', '0128_auto_20220620_2210'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='problemdata',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('custom', 'Custom checker (PY)'), ('customval', 'Custom validator (CPP)'), ('interact', 'Interactive'), ('testlib', 'Testlib')], max_length=10, verbose_name='checker'),
+        ),
+        migrations.AlterField(
+            model_name='problemtestcase',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('custom', 'Custom checker (PY)'), ('customval', 'Custom validator (CPP)'), ('interact', 'Interactive'), ('testlib', 'Testlib')], max_length=10, verbose_name='checker'),
+        ),
+    ]
diff --git a/judge/models/problem_data.py b/judge/models/problem_data.py
index f219197..c47559a 100644
--- a/judge/models/problem_data.py
+++ b/judge/models/problem_data.py
@@ -40,6 +40,7 @@ CHECKERS = (
     ("custom", _("Custom checker (PY)")),
     ("customval", _("Custom validator (CPP)")),
     ("interact", _("Interactive")),
+    ("testlib", _("Testlib")),
 )
 
 
diff --git a/judge/utils/problem_data.py b/judge/utils/problem_data.py
index b827d71..95b5a12 100644
--- a/judge/utils/problem_data.py
+++ b/judge/utils/problem_data.py
@@ -96,6 +96,21 @@ class ProblemDataCompiler(object):
                     },
                 }
 
+            if case.checker == "testlib":
+                custom_checker_path = split_path_first(case.custom_validator.name)
+                if len(custom_checker_path) != 2:
+                    raise ProblemDataError(
+                        _("How did you corrupt the custom checker path?")
+                    )
+                return {
+                    "name": "bridged",
+                    "args": {
+                        "files": custom_checker_path[1],
+                        "lang": "CPP14",
+                        "type": "testlib",
+                    },
+                }
+
             if case.checker_args:
                 return {
                     "name": case.checker,
@@ -215,8 +230,11 @@ class ProblemDataCompiler(object):
             init["output_prefix_length"] = self.data.output_prefix
         if self.data.checker:
             if self.data.checker == "interact":
+                interactor_path = split_path_first(self.data.interactive_judge.name)
+                if len(interactor_path) != 2:
+                    raise ProblemDataError(_("How did you corrupt the interactor path?"))
                 init["interactive"] = {
-                    "files": split_path_first(self.data.interactive_judge.name)[1],
+                    "files": interactor_path[1],
                     "feedback": True,
                     "type": "lqdoj",
                 }
diff --git a/templates/problem/data.html b/templates/problem/data.html
index 1b77d85..0274d75 100644
--- a/templates/problem/data.html
+++ b/templates/problem/data.html
@@ -46,7 +46,6 @@
             update_select2();
 
             function autofill_if_exists($select, file) {
-                console.log(1);
                 if (!$select.val() && ~window.valid_files.indexOf(file))
                     $select.val(file).trigger('change');
             }
@@ -154,7 +153,7 @@
 
                 $checker.change(function () {
                     $tr_checker.toggle($checker.val() == 'custom').change();
-                    $tr_validator.toggle($checker.val() == 'customval').change();
+                    $tr_validator.toggle($checker.val() == 'customval' || $checker.val() == 'testlib').change();
                     $tr_interactive.toggle($checker.val() == 'interact').change();
 
                     $sample.toggle(['custom', 'customval', 'interact'].includes($checker.val())).change();