diff --git a/js/main.js b/js/main.js
index bbc075b..92ddf58 100644
--- a/js/main.js
+++ b/js/main.js
@@ -2175,10 +2175,19 @@ class PackTestDialog extends DialogOverlay {
                     level.advance_tic(input);
 
                     if (level.state === 'success') {
-                        // TODO warn if exit early?
-                        record_result(
-                            'success', "Won",
-                            `Exited successfully after ${util.format_duration(level.tic_counter / TICS_PER_SECOND)} (delta ${level.tic_counter - replay.duration})`);
+                        if (level.tic_counter < replay.duration - 10) {
+                            // Early exit is dubious (e.g. this happened sometimes before multiple
+                            // players were implemented correctly)
+                            record_result(
+                                'early', "Won early",
+                                `Exited early after ${util.format_duration(level.tic_counter / TICS_PER_SECOND)} with ${util.format_duration((replay.duration - level.tic_counter) / TICS_PER_SECOND)} left in the replay`,
+                                true);
+                        }
+                        else {
+                            record_result(
+                                'success', "Won",
+                                `Exited successfully after ${util.format_duration(level.tic_counter / TICS_PER_SECOND)} (delta ${level.tic_counter - replay.duration})`);
+                        }
                         num_passed += 1;
                         break;
                     }
diff --git a/style.css b/style.css
index cc99eb8..d4ca4ad 100644
--- a/style.css
+++ b/style.css
@@ -605,6 +605,9 @@ ol.packtest-colorcoded > li[data-status=running] {
 ol.packtest-colorcoded > li[data-status=success] {
     background: hsl(120, 60%, 75%);
 }
+ol.packtest-colorcoded > li[data-status=early] {
+    background: hsl(75, 60%, 75%);
+}
 ol.packtest-colorcoded > li[data-status=failure] {
     background: hsl(0, 60%, 60%);
 }