diff --git a/map_gen/Diggy/Config.lua b/map_gen/Diggy/Config.lua
index 78add2aa..76c445f5 100644
--- a/map_gen/Diggy/Config.lua
+++ b/map_gen/Diggy/Config.lua
@@ -282,7 +282,7 @@ local Config = {
 
             -- add or remove a table entry to add or remove a unlockable item from the mall.
             -- format: {unlock_at_level, price, prototype_name},
-            unlockables = require('map_gen.Diggy.FormatMarketItems').initalize_unlockables(
+            unlockables = require('map_gen.Diggy.FormatMarketItems').initialize_unlockables(
                 {
                     {level = 1, price = 50, name = 'raw-fish'},
                     {level = 1, price = 50, name = 'steel-axe'},
@@ -312,7 +312,7 @@ local Config = {
             },
 
             -- controls the formula for calculating level up costs in stone sent to surface
-            difficulity_scale = 25, -- Diggy default 25. Higher increases difficulity, lower decreases (Only affects the stone requirement/cost to level up) (Only integers has been tested succesful)
+            difficulty_scale = 25, -- Diggy default 25. Higher increases difficulity, lower decreases (Only affects the stone requirement/cost to level up) (Only integers has been tested succesful)
             start_stone = 50, -- Diggy default 50. This sets the price for the first level.
             cost_precision = 2, -- Diggy default 2. This sets the precision of the stone requirements to level up. E.g. 1234 becomes 1200 with precision 2 and 1230 with precision 3.
         },
diff --git a/map_gen/Diggy/FormatMarketItems.lua b/map_gen/Diggy/FormatMarketItems.lua
index 70bb618b..f46052fd 100644
--- a/map_gen/Diggy/FormatMarketItems.lua
+++ b/map_gen/Diggy/FormatMarketItems.lua
@@ -27,7 +27,7 @@ end
 -- @field price number of the price in the configured currency_item to buy the item in the market
 -- @field name string of the factorio prototype-name for the entity to be unlocked
 --
-function FormatMarketItems.initalize_unlockables(items)
+function FormatMarketItems.initialize_unlockables(items)
     local unlockables = {}
     for _, item in ipairs(items) do
         add(item.level, item.price, item.name)
diff --git a/map_gen/Diggy/MarketUnlockables.lua b/map_gen/Diggy/MarketUnlockables.lua
index 775d225a..78118a96 100644
--- a/map_gen/Diggy/MarketUnlockables.lua
+++ b/map_gen/Diggy/MarketUnlockables.lua
@@ -1,10 +1,8 @@
 -- dependencies
-local Config = require 'map_gen.Diggy.config'.features.MarketExchange
+local Config = require 'map_gen.Diggy.Config'.features.MarketExchange
 
 -- this
 local MarketUnlockables = {}
-local marked_prototype_items = {}
-local insert = table.insert
 local floor = math.floor
 local ceil = math.ceil
 local log10 = math.log10
@@ -17,37 +15,37 @@ local log10 = math.log10
 --
 local function truncate(precision, precise_number)
     local number = precise_number
-    local numberlen = floor(log10(number)+1)
-    precision = (numberlen >= 8) and (precision+1) or precision
-    local exponent = numberlen-precision
+    local number_length = floor(log10(number)+1)
+    precision = (number_length >= 8) and (precision+1) or precision
+    local exponent = number_length -precision
     number = number/10^exponent
     number = floor(number)*10^exponent
-    return number, numberlen
+    return number, number_length
 end
 
---- Handles the level requirement to stone sent. Calculates based on a forumla one number corresponding to that levels cost
--- You can configure this in Diggy.Config.lua under features.MarketExhange
+--- Handles the level requirement to stone sent. Calculates based on a formula one number corresponding to that levels cost
+-- You can configure this in Diggy.Config.lua under features.MarketExchange
 -- @param level number of a level
 -- @returns number of cost corresponding to the level based on a calculation
 --
 function MarketUnlockables.calculate_level(level) -- all configurable variables must be integers.
-    local b = floor(Config.difficulity_scale) or 25 -- Default 25 <-- Controls how much stone is needed.
+    local b = floor(Config.difficulty_scale) or 25 -- Default 25 <-- Controls how much stone is needed.
     local start_value = floor(Config.start_stone) or 50 -- The start value/the first level cost
     local formula = b*(level^3)+(start_value-b)
         
     local precision = floor(Config.cost_precision) or 2 -- Sets the precision
         
-    -- Truncates to the precision and prevents dublicates by incrementing with 5 in the third highest place.
-    -- First evaluates loosly if the previous level requirement would return same number after truncating. 
+    -- Truncates to the precision and prevents duplicates by incrementing with 5 in the third highest place.
+    -- First evaluates loosely if the previous level requirement would return same number after truncating.
     -- If true evaluates down all levels to level 1 for the precise number 
     -- (In case itself got incremented) 
-    -- Only useful if three or more values turns out to be the same after truncating, thus the loosly evaluation to save an expensive recursive function
-    local number, numberlen = truncate(precision, formula)
+    -- Only useful if three or more values turns out to be the same after truncating, thus the loosely evaluation to save an expensive recursive function
+    local number, number_lenght = truncate(precision, formula)
     local prev_number = truncate(precision, b*((level-1)^3)+(start_value-b))
     if (level ~= 1 and number == prev_number) then
         local prev_number = MarketUnlockables.calculate_level((level-1))
         while (prev_number >= number) do
-            number = (prev_number < number) and number or ceil(number + (5*10^(numberlen-3)))
+            number = (prev_number < number) and number or ceil(number + (5*10^(number_lenght -3)))
         end
     end
     return number