diff --git a/src/main/java/spawnog/login/LoginMigrationService.java b/src/main/java/spawnog/login/LoginMigrationService.java
index d053530..227b5fc 100644
--- a/src/main/java/spawnog/login/LoginMigrationService.java
+++ b/src/main/java/spawnog/login/LoginMigrationService.java
@@ -66,7 +66,14 @@ public final class LoginMigrationService {
         boolean normalizeGamemode = managedWorld && !mayKeepGamemode
                 && plugin.getConfig().getBoolean("login-safety.normalize-non-staff-gamemode", true);
         // A sanctioned spectator is working, not an abandoned autopsy state.
-        boolean autopsyMigration = managedWorld && !staff && !mayKeepGamemode && originalGamemode == GameMode.SPECTATOR
+        // A minigame puts its own players into spectator legitimately, so a disconnect
+        // from an arena looks exactly
+        // like the abandoned season 1 state this migration exists to rescue. Migrating
+        // one of those would burn the
+        // player's one-shot flag and record the arena as their /spawnback location.
+        boolean minigameArena = MinigameArenas.contains(player);
+        boolean autopsyMigration = managedWorld && !staff && !mayKeepGamemode && !minigameArena
+                && originalGamemode == GameMode.SPECTATOR
                 && plugin.getConfig().getBoolean("login-safety.autopsy-migration.enabled", true)
                 && !migrationStore.hasMigrated(player.getUniqueId());
         boolean vulnerableAfterLogin = normalizeGamemode || originalGamemode == GameMode.SURVIVAL
diff --git a/src/main/java/spawnog/login/MinigameArenas.java b/src/main/java/spawnog/login/MinigameArenas.java
new file mode 100644
index 0000000..f84675c
--- /dev/null
+++ b/src/main/java/spawnog/login/MinigameArenas.java
@@ -0,0 +1,130 @@
+package spawnog.login;
+
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Locale;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+// Reports whether a player is inside a minigame arena.
+//
+// Autopsy migration exists for OG:SMP season 1 players who were left in spectator mode on the SMP. A minigame puts
+// its own players into spectator legitimately -- Spleef does it to everyone it eliminates, and Splegg runs whole
+// matches in worlds it owns -- so without this check a routine minigame disconnect looks identical to the state the
+// migration is meant to rescue. Migrating one of those players burns their one-shot migration flag and records the
+// arena as their /spawnback location.
+//
+// Every lookup is reflective and optional: no minigame is a dependency, and an absent one simply answers "no".
+public final class MinigameArenas {
+
+    private static final String SPLEEF_PLUGIN = "Spleef-OG";
+    private static final String SPLEEF_API = "net.trueog.spleefog.api.SpleefAPI";
+    private static final String SPLEGG_PLUGIN = "Splegg-OG";
+    private static final String DUELS_PLUGIN = "Duels-OG";
+
+    private MinigameArenas() {
+
+    }
+
+    public static boolean contains(Player player) {
+
+        return player != null && (inSpleef(player) || inSplegg(player) || inDuel(player));
+
+    }
+
+    private static boolean inSpleef(Player player) {
+
+        Plugin plugin = enabled(SPLEEF_PLUGIN);
+        if (plugin == null)
+            return false;
+
+        try {
+
+            Class<?> api = Class.forName(SPLEEF_API, true, plugin.getClass().getClassLoader());
+            if (Boolean.TRUE.equals(api.getMethod("isInSpleef", Player.class).invoke(null, player)))
+                return true;
+
+            // Survives a crash, where the live session is gone but the saved pre-match
+            // state is not. That is
+            // exactly the login on which a minigame casualty would otherwise be mistaken
+            // for an SMP one.
+            Method pending = api.getMethod("hasPendingRecovery", java.util.UUID.class);
+            return Boolean.TRUE.equals(pending.invoke(null, player.getUniqueId()));
+
+        } catch (ReflectiveOperationException | RuntimeException ex) {
+
+            return false;
+
+        }
+
+    }
+
+    // Splegg owns the worlds its games run in, so the player's world answers this
+    // even after the game has ended.
+    private static boolean inSplegg(Player player) {
+
+        Plugin plugin = enabled(SPLEGG_PLUGIN);
+        if (plugin == null)
+            return false;
+
+        String world = player.getWorld().getName();
+        try {
+
+            Object configured = plugin.getClass().getMethod("getInGameWorlds").invoke(plugin);
+            if (configured instanceof List<?> worlds) {
+
+                for (Object name : worlds) {
+
+                    if (name != null && world.equalsIgnoreCase(name.toString()))
+                        return true;
+
+                }
+
+            }
+
+            Object prefix = plugin.getClass().getMethod("getGameWorldPrefix").invoke(plugin);
+            // Per-game worlds are named <prefix><gameId>-<map>.
+            return prefix != null && !prefix.toString().isEmpty()
+                    && world.toLowerCase(Locale.ROOT).startsWith(prefix.toString().toLowerCase(Locale.ROOT));
+
+        } catch (ReflectiveOperationException | RuntimeException ex) {
+
+            return false;
+
+        }
+
+    }
+
+    private static boolean inDuel(Player player) {
+
+        Plugin plugin = enabled(DUELS_PLUGIN);
+        if (plugin == null)
+            return false;
+
+        try {
+
+            Object arenaManager = plugin.getClass().getMethod("getArenaManager").invoke(plugin);
+            if (arenaManager == null)
+                return false;
+
+            Method query = arenaManager.getClass().getMethod("isInMatch", Player.class);
+            query.setAccessible(true);
+            return Boolean.TRUE.equals(query.invoke(arenaManager, player));
+
+        } catch (ReflectiveOperationException | RuntimeException ex) {
+
+            return false;
+
+        }
+
+    }
+
+    private static Plugin enabled(String name) {
+
+        Plugin plugin = Bukkit.getPluginManager().getPlugin(name);
+        return plugin != null && plugin.isEnabled() ? plugin : null;
+
+    }
+
+}