diff --git a/inc/audio/audio.generator.lua b/inc/audio/audio.generator.lua
index 6143160..71db319 100644
--- a/inc/audio/audio.generator.lua
+++ b/inc/audio/audio.generator.lua
@@ -1,6 +1,4 @@
-unpack = unpack or table.unpack
-
-musicator_markov_model = {
+local musicator_markov_model = {
   model = {
     ["...|..."] = {
       next = {
@@ -655,7 +653,7 @@ end
 local function musicator_count_notes(sequence)
   local result = 0
 
-  for i,v in ipairs(sequence) do
+  for _,v in ipairs(sequence) do
     if not (v == "...") then
       result = result + 1
     end
@@ -664,7 +662,7 @@ local function musicator_count_notes(sequence)
   return result
 end
 
-function musicator_generate_sequence(model_data, length)
+local function musicator_generate_sequence(model_data, length)
   local order = model_data.order
   local model = model_data.model
 
@@ -704,12 +702,12 @@ function musicator_generate_sequence(model_data, length)
   return seq
 end
 
-function musicator_row_to_frame(row, bpm, spd)
+local function musicator_row_to_frame(row, bpm, spd)
   local frames_per_row = (150 * spd) / bpm
   return math.floor(row * frames_per_row)
 end
 
-function musicator_note_to_direction(note)
+local function musicator_note_to_direction(note)
   local subnote = note:sub(1,1)
 
   local mapping = {
@@ -725,7 +723,7 @@ function musicator_note_to_direction(note)
 end
 
 -- converts generated sequence to pattern that the ddr minigame can consume
-function musicator_sequence_to_pattern(sequence, bpm, spd)
+local function musicator_sequence_to_pattern(sequence, bpm, spd)
   local result = {}
 
   for i, note in ipairs(sequence) do
@@ -733,7 +731,7 @@ function musicator_sequence_to_pattern(sequence, bpm, spd)
 
       local at_ms = musicator_row_to_frame(i, bpm, spd)
       local direction = musicator_note_to_direction(note)
-    
+
       result[#result + 1] = { frame=at_ms, dir=direction, note=note }
     end
   end
@@ -741,6 +739,6 @@ function musicator_sequence_to_pattern(sequence, bpm, spd)
   return result
 end
 
-function musicator_generate_pattern(length, bpm, spd)
+local function musicator_generate_pattern(length, bpm, spd)
   return musicator_sequence_to_pattern(musicator_generate_sequence(musicator_markov_model, length), bpm, spd)
 end
diff --git a/inc/window/window.minigame.ddr.lua b/inc/window/window.minigame.ddr.lua
index 1d06d25..0218cc6 100644
--- a/inc/window/window.minigame.ddr.lua
+++ b/inc/window/window.minigame.ddr.lua
@@ -60,11 +60,9 @@ function MinigameDDRWindow.prepareSong(song, generated_length, special_mode)
       current_song.end_frame = pattern[#pattern].frame
 
       if special_mode == "only_special" then
-        local cntr = 1
-        for i, v in ipairs(current_song.pattern) do
+        for i, _ in ipairs(current_song.pattern) do
           current_song.pattern[i].special = (i % 5 == 0)
         end
-      elseif special_mode == "" then
       end
     end
 
@@ -104,7 +102,7 @@ function MinigameDDRWindow.on_end(game_context)
   game_context.win_timer = Config.timing.minigame_win_duration
 
   local num_special = 0
-  for i,v in ipairs(game_context.current_song.pattern) do
+  for _,v in ipairs(game_context.current_song.pattern) do
     if game_context.special_mode == "only_left" then
       num_special = num_special + ((v.dir == "left" and 1) or 0)
     else
@@ -119,8 +117,6 @@ function MinigameDDRWindow.on_end(game_context)
     was_ok = game_context.special_mode_counter == num_special
   elseif game_context.special_mode == "only_left" then
     was_ok = game_context.special_mode_counter == num_special
-  elseif game_context.special_mode == "only_nothing" then
-    -- nothing to do here :D
   end
 
   game_context.special_mode_condition = game_context.special_mode_condition and was_ok