diff --git a/src/configuration.rs b/src/configuration.rs
index ec75d24..9370987 100644
--- a/src/configuration.rs
+++ b/src/configuration.rs
@@ -29,8 +29,13 @@ impl Configuration {
 pub struct GeneralConfiguration {
     #[serde(default = "default_true")]
     pub enable: bool,
-    #[serde(default)]
+
+    #[serde(default = "default_true")]
     pub export_class: bool,
+
+    #[serde(default = "default_false")]
+    pub fail_over_lamp: bool,
+
     #[serde(default = "default_timeout")]
     pub timeout: u64,
 }
@@ -39,6 +44,10 @@ fn default_true() -> bool {
     true
 }
 
+fn default_false() -> bool {
+    false
+}
+
 fn default_timeout() -> u64 {
     3000
 }
diff --git a/src/crypto.rs b/src/crypto.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/helpers.rs b/src/helpers.rs
index dccdb74..5327b64 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -129,7 +129,6 @@ pub fn read_hinternet_url(handle: HINTERNET) -> Result<String> {
     Err(anyhow!("Could not get URL from HINTERNET handle: {ec}"))
 }
 
-/// Read all bytes of a slice into a buffer.
 pub fn read_slice(buf: *const u8, len: usize) -> Result<Vec<u8>> {
     let mut slice = unsafe { std::slice::from_raw_parts(buf, len) };
     let mut ret = Vec::with_capacity(len);
diff --git a/src/saekawa.rs b/src/saekawa.rs
index ee57050..58112df 100644
--- a/src/saekawa.rs
+++ b/src/saekawa.rs
@@ -20,7 +20,7 @@ use crate::{
     },
     types::{
         game::UpsertUserAllRequest,
-        tachi::{ClassEmblem, Import, ImportClasses, ImportScore},
+        tachi::{ClassEmblem, Difficulty, Import, ImportClasses, ImportScore},
     },
     CONFIGURATION, TACHI_IMPORT_URL, TACHI_STATUS_URL, UPSERT_USER_ALL_API_ENCRYPTED,
 };
@@ -41,6 +41,16 @@ pub fn hook_init() -> Result<()> {
         .as_u64()
         .ok_or(anyhow::anyhow!("Couldn't parse user from Tachi response"))?;
 
+    let mut permissions = resp["body"]["permissions"]
+        .as_array()
+        .ok_or(anyhow!("Couldn't parse permissions from Tachi response"))?
+        .into_iter()
+        .filter_map(|v| v.as_str());
+
+    if permissions.all(|v| v != "submit_score") {
+        return Err(anyhow!("API key has insufficient permission. The permission submit_score must be set."));
+    }
+
     info!("Logged in to Tachi with userID {user_id}");
 
     let winhttpwritedata = unsafe {
@@ -50,12 +60,13 @@ pub fn hook_init() -> Result<()> {
     };
 
     unsafe {
-        DetourWriteData.initialize(winhttpwritedata, winhttpwritedata_hook)?;
-
-        DetourWriteData.enable()?;
+        DetourWriteData
+            .initialize(winhttpwritedata, winhttpwritedata_hook)?
+            .enable()?;
     };
 
     info!("Hook successfully initialized");
+
     Ok(())
 }
 
@@ -191,11 +202,13 @@ fn winhttpwritedata_hook(
         .user_playlog_list
         .into_iter()
         .filter_map(|playlog| {
-            if let Ok(score) = ImportScore::try_from(playlog) {
-                if score.difficulty.as_str() == "WORLD'S END" {
-                    return None;
-                }
-                Some(score)
+            let result =
+                ImportScore::try_from_playlog(playlog, CONFIGURATION.general.fail_over_lamp);
+            if result
+                .as_ref()
+                .is_ok_and(|v| v.difficulty != Difficulty::WorldsEnd)
+            {
+                result.ok()
             } else {
                 None
             }
diff --git a/src/types/tachi.rs b/src/types/tachi.rs
index aa55c71..d40d5e7 100644
--- a/src/types/tachi.rs
+++ b/src/types/tachi.rs
@@ -1,4 +1,4 @@
-use anyhow::anyhow;
+use anyhow::Result;
 use chrono::{FixedOffset, NaiveDateTime, TimeZone};
 use num_enum::TryFromPrimitive;
 use serde::{Deserialize, Serialize};
@@ -68,7 +68,7 @@ pub struct ImportScore {
     pub lamp: TachiLamp,
     pub match_type: String,
     pub identifier: String,
-    pub difficulty: String,
+    pub difficulty: Difficulty,
     pub time_achieved: u128,
     pub judgements: Judgements,
     pub optional: OptionalMetrics,
@@ -93,6 +93,28 @@ pub enum TachiLamp {
     AllJusticeCritical = 4,
 }
 
+#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize, TryFromPrimitive)]
+#[repr(u32)]
+pub enum Difficulty {
+    #[serde(rename = "BASIC")]
+    Basic = 0,
+
+    #[serde(rename = "ADVANCED")]
+    Advanced = 1,
+
+    #[serde(rename = "EXPERT")]
+    Expert = 2,
+
+    #[serde(rename = "MASTER")]
+    Master = 3,
+
+    #[serde(rename = "ULTIMA")]
+    Ultima = 4,
+
+    #[serde(rename = "WORLD'S END")]
+    WorldsEnd = 5,
+}
+
 #[derive(Debug, Clone, Default, Serialize, Deserialize)]
 pub struct Judgements {
     pub jcrit: u32,
@@ -107,11 +129,11 @@ pub struct OptionalMetrics {
     pub max_combo: u32,
 }
 
-impl TryFrom<UserPlaylog> for ImportScore {
-    type Error = anyhow::Error;
-
-    fn try_from(p: UserPlaylog) -> Result<ImportScore, Self::Error> {
-        let lamp = if p.is_all_justice {
+impl ImportScore {
+    pub fn try_from_playlog(p: UserPlaylog, fail_over_lamp: bool) -> Result<ImportScore> {
+        let lamp = if !p.is_clear && fail_over_lamp {
+            TachiLamp::Failed
+        } else if p.is_all_justice {
             if p.judge_justice + p.judge_attack + p.judge_guilty == 0 {
                 TachiLamp::AllJusticeCritical
             } else {
@@ -133,23 +155,11 @@ impl TryFrom<UserPlaylog> for ImportScore {
         };
 
         let rom_major_version = p.rom_version.split('.').next().unwrap_or("2");
-        let difficulty = match p.level {
-            0 => "BASIC",
-            1 => "ADVANCED",
-            2 => "EXPERT",
-            3 => "MASTER",
-            4 => if rom_major_version == "2" {
-                "ULTIMA"
-            } else {
-                "WORLD'S END"
-            },
-            5 => if rom_major_version == "2" {
-                "WORLD'S END"
-            } else {
-                return Err(anyhow!("difficulty index '5' should not be possible on rom_version {rom_major_version}."));
-            },
-            _ => return Err(anyhow!("unknown difficulty index {level} on major version {rom_major_version}", level=p.level)),
-        }.to_string();
+        let difficulty = if rom_major_version == "1" && p.level == 4 {
+            Difficulty::WorldsEnd
+        } else {
+            Difficulty::try_from(p.level)?
+        };
 
         let datetime = NaiveDateTime::parse_from_str(&p.user_play_date, "%Y-%m-%d %H:%M:%S")?;
         let jst_offset =