diff --git a/PTT-Plugin/Data/ExfilsTargets.cs b/PTT-Plugin/Data/ExfilsTargets.cs
index 9341756..485ac31 100644
--- a/PTT-Plugin/Data/ExfilsTargets.cs
+++ b/PTT-Plugin/Data/ExfilsTargets.cs
@@ -80,6 +80,7 @@ public bool IsAvailable()
         }
 
         bool playerIsHighLevel = Helpers.PlayerProfile.GetLevel() >= 20;
+        bool playerIsLowLevel = !playerIsHighLevel;
         bool isSandboxLow = transitMapId.ToLower() == "sandbox";
         bool isSandboxHigh = transitMapId.ToLower() == "sandbox_high";
 
@@ -88,7 +89,7 @@ public bool IsAvailable()
             return false;
         }
 
-        if (!playerIsHighLevel && isSandboxHigh)
+        if (playerIsLowLevel && isSandboxHigh)
         {
             return false;
         }
diff --git a/PTT-Plugin/Services/ExfilPromptService.cs b/PTT-Plugin/Services/ExfilPromptService.cs
index 1bb1efc..ff29207 100644
--- a/PTT-Plugin/Services/ExfilPromptService.cs
+++ b/PTT-Plugin/Services/ExfilPromptService.cs
@@ -18,7 +18,13 @@ public class ExfilPromptService(
     ExfilsTargetsService exfilsTargetsService
 )
 {
-    public void InitPromptHandlers()
+    public void Init()
+    {
+        ieService.DisableVanillaActions = true;
+        InitPromptHandlers();
+    }
+
+    private void InitPromptHandlers()
     {
         // requires manual activation (no auto-extract even if the player enabled the IEAPI option in BepInEx)
         ieService.OnActionsAppliedEvent += RequiresManualActivation;
@@ -160,13 +166,12 @@ private OnActionsAppliedResult ExfilPromptHandler(ExfiltrationPoint exfil, Custo
 
     private OnActionsAppliedResult RequiresManualActivation(ExfiltrationPoint exfil, CustomExfilTrigger customExfilTrigger, bool exfilIsAvailableToPlayer)
     {
-        // compat with older version of Interactable Exfils API (< 1.4.0)
+        // avoid crash with older version of Interactable Exfils API (< 1.4.0)
         if (customExfilTrigger == null)
         {
             return null;
         }
 
-        // TODO: find out why it doesn't work as intended? (in some cases, when player enable/disable the bepinex setting manually)
         customExfilTrigger.RequiresManualActivation = true;
         return null;
     }
diff --git a/PTT-Plugin/Services/IEApiWrapper.cs b/PTT-Plugin/Services/IEApiWrapper.cs
index cff34d1..daaab58 100644
--- a/PTT-Plugin/Services/IEApiWrapper.cs
+++ b/PTT-Plugin/Services/IEApiWrapper.cs
@@ -11,9 +11,7 @@ public static void Init(ExfilsTargetsService exfilsTargetsService)
 
         if (interactableExfilsService != null)
         {
-            interactableExfilsService.DisableVanillaActions = true;
-            var exfilPromptService = new ExfilPromptService(interactableExfilsService, exfilsTargetsService);
-            exfilPromptService.InitPromptHandlers();
+            new ExfilPromptService(interactableExfilsService, exfilsTargetsService).Init();
             Logger.Info($"Jehree's Interactable Exfils API: initialized exfils prompt service");
         }
         else