diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..0023a62d
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,212 @@
+# editorconfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Default settings:
+# A newline ending every file
+# Use 4 spaces as indentation
+[*]
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[project.json]
+indent_size = 2
+
+# C# and Visual Basic files
+[*.{cs,vb}]
+charset = utf-8-bom
+
+# Analyzers
+dotnet_analyzer_diagnostic.category-Security.severity = error
+dotnet_code_quality.ca1802.api_surface = private, internal
+# SYSLIB5001: Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
+dotnet_diagnostic.SYSLIB5001.severity = suggestion
+
+# Miscellaneous style rules
+dotnet_sort_system_directives_first = true
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# avoid this. unless absolutely necessary
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# name all constant fields using PascalCase
+dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols = constant_fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.constant_fields.applicable_kinds = field
+dotnet_naming_symbols.constant_fields.required_modifiers = const
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+
+# static fields should have s_ prefix
+dotnet_naming_rule.static_fields_should_have_prefix.severity = suggestion
+dotnet_naming_rule.static_fields_should_have_prefix.symbols = static_fields
+dotnet_naming_rule.static_fields_should_have_prefix.style = static_prefix_style
+dotnet_naming_symbols.static_fields.applicable_kinds = field
+dotnet_naming_symbols.static_fields.required_modifiers = static
+dotnet_naming_symbols.static_fields.applicable_accessibilities = private, internal, private_protected
+dotnet_naming_style.static_prefix_style.required_prefix = s_
+dotnet_naming_style.static_prefix_style.capitalization = camel_case
+
+# internal and private fields should be _camelCase
+dotnet_naming_rule.camel_case_for_private_internal_fields.severity = suggestion
+dotnet_naming_rule.camel_case_for_private_internal_fields.symbols = private_internal_fields
+dotnet_naming_rule.camel_case_for_private_internal_fields.style = camel_case_underscore_style
+dotnet_naming_symbols.private_internal_fields.applicable_kinds = field
+dotnet_naming_symbols.private_internal_fields.applicable_accessibilities = private, internal
+dotnet_naming_style.camel_case_underscore_style.required_prefix = _
+dotnet_naming_style.camel_case_underscore_style.capitalization = camel_case
+
+# Code quality
+dotnet_style_readonly_field = true:suggestion
+dotnet_code_quality_unused_parameters = non_public:suggestion
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:refactoring
+dotnet_style_prefer_conditional_expression_over_return = true:refactoring
+
+# CA2208: Instantiate argument exceptions correctly
+dotnet_diagnostic.CA2208.severity = error
+
+# C# files
+[*.cs]
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = one_less_than_current
+
+# Modifier preferences
+csharp_preferred_modifier_order = public,private,protected,internal,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,volatile,async:suggestion
+
+# Code style defaults
+csharp_using_directive_placement = outside_namespace:suggestion
+csharp_prefer_braces = true:refactoring
+csharp_preserve_single_line_blocks = true:none
+csharp_preserve_single_line_statements = false:none
+csharp_prefer_static_local_function = true:suggestion
+csharp_prefer_simple_using_statement = false:none
+csharp_style_prefer_switch_expression = true:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = true:refactoring
+csharp_style_expression_bodied_constructors = true:refactoring
+csharp_style_expression_bodied_operators = true:refactoring
+csharp_style_expression_bodied_properties = true:refactoring
+csharp_style_expression_bodied_indexers = true:refactoring
+csharp_style_expression_bodied_accessors = true:refactoring
+csharp_style_expression_bodied_lambdas = true:refactoring
+csharp_style_expression_bodied_local_functions = true:refactoring
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true:suggestion
+
+# Null checking preferences
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Other features
+csharp_style_prefer_index_operator = false:none
+csharp_style_prefer_range_operator = false:none
+csharp_style_pattern_local_over_anonymous_function = false:none
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = do_not_ignore
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+
+# Namespace preference
+csharp_style_namespace_declarations = file_scoped:suggestion
+
+# Types: use keywords instead of BCL types, and permit var only when the type is clear
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = false:none
+csharp_style_var_elsewhere = false:suggestion
+
+# Visual Basic files
+[*.vb]
+# Modifier preferences
+visual_basic_preferred_modifier_order = Partial,Default,Private,Protected,Public,Friend,NotOverridable,Overridable,MustOverride,Overloads,Overrides,MustInherit,NotInheritable,Static,Shared,Shadows,ReadOnly,WriteOnly,Dim,Const,WithEvents,Widening,Narrowing,Custom,Async:suggestion
+
+# C++ Files
+[*.{cpp,h,in}]
+curly_bracket_next_line = true
+indent_brace_style = Allman
+
+# Xml project files
+[*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,nativeproj,locproj}]
+indent_size = 2
+
+# Xml build files
+[*.builds]
+indent_size = 2
+
+# Xml files
+[*.{xml,stylecop,resx,ruleset}]
+indent_size = 2
+
+# Xml config files
+[*.{props,targets,config,nuspec}]
+indent_size = 2
+
+# Shell scripts
+[*.sh]
+end_of_line = lf
+
+[*.{cmd, bat}]
+end_of_line = crlf
+
+# Markdown files
+[*.md]
+ # Double trailing spaces can be used for BR tags, and other instances are enforced by Markdownlint
+trim_trailing_whitespace = false
\ No newline at end of file
diff --git a/MathGame.engapantio/MathGame.engapantio.csproj b/MathGame.engapantio/MathGame.engapantio.csproj
new file mode 100644
index 00000000..2150e379
--- /dev/null
+++ b/MathGame.engapantio/MathGame.engapantio.csproj
@@ -0,0 +1,10 @@
+
+
+
+ Exe
+ net8.0
+ enable
+ enable
+
+
+
diff --git a/MathGame.engapantio/Program.cs b/MathGame.engapantio/Program.cs
new file mode 100644
index 00000000..9f4a54bf
--- /dev/null
+++ b/MathGame.engapantio/Program.cs
@@ -0,0 +1,219 @@
+using System.Diagnostics;
+
+List gameHistory = [];
+var random = new Random();
+
+while (true)
+{
+ Console.WriteLine("Math Game");
+ Console.WriteLine("1. Addition");
+ Console.WriteLine("2. Subtraction");
+ Console.WriteLine("3. Multiplication");
+ Console.WriteLine("4. Division");
+ Console.WriteLine("5. Random Game");
+ Console.WriteLine("6. History");
+ Console.WriteLine("0. Exit");
+ Console.Write("Choose an option: ");
+
+ switch (Console.ReadLine())
+ {
+ case "1":
+ PlayGame(ArithmeticOperation.Addition, gameHistory, random);
+ break;
+ case "2":
+ PlayGame(ArithmeticOperation.Subtraction, gameHistory, random);
+ break;
+ case "3":
+ PlayGame(ArithmeticOperation.Multiplication, gameHistory, random);
+ break;
+ case "4":
+ PlayGame(ArithmeticOperation.Division, gameHistory, random);
+ break;
+ case "5":
+ PlayGame(null, gameHistory, random);
+ break;
+ case "6":
+ ShowHistory(gameHistory);
+ break;
+ case "0":
+ return;
+ default:
+ Console.WriteLine("Please choose a valid menu option.");
+ break;
+ }
+
+ Console.WriteLine();
+}
+
+static void PlayGame(
+ ArithmeticOperation? selectedOperation,
+ List gameHistory,
+ Random random)
+{
+ DifficultyLevel difficulty = ReadDifficulty();
+ int questionCount = ReadQuestionCount();
+ int maximumOperand = difficulty switch
+ {
+ DifficultyLevel.Easy => 10,
+ DifficultyLevel.Medium => 50,
+ DifficultyLevel.Hard => 100,
+ _ => throw new InvalidOperationException("Unknown difficulty level.")
+ };
+ var score = 0;
+ Stopwatch stopwatch = Stopwatch.StartNew();
+
+ for (var questionNumber = 1; questionNumber <= questionCount; questionNumber++)
+ {
+ ArithmeticOperation operation = selectedOperation ?? (ArithmeticOperation)random.Next(0, 4);
+ MathQuestion question = CreateQuestion(operation, maximumOperand, random);
+
+ Console.WriteLine($"Question {questionNumber}/{questionCount}: {question.Prompt}");
+ Console.Write("Your answer: ");
+ string? answerText = Console.ReadLine();
+ bool isValidAnswer = int.TryParse(answerText, out int answer);
+
+ if (isValidAnswer && (answer == question.CorrectAnswer))
+ {
+ score++;
+ Console.WriteLine("Correct!");
+ }
+ else if (isValidAnswer)
+ {
+ Console.WriteLine($"Incorrect. The answer was {question.CorrectAnswer}.");
+ }
+ else
+ {
+ Console.WriteLine($"Invalid answer. The answer was {question.CorrectAnswer}.");
+ }
+ }
+
+ stopwatch.Stop();
+ string mode = selectedOperation?.ToString() ?? "Random";
+ var result = new GameResult(mode, difficulty, score, questionCount, stopwatch.Elapsed);
+ gameHistory.Add(result);
+
+ Console.WriteLine($"Game complete: {score}/{questionCount} correct.");
+ Console.WriteLine($"Elapsed time: {stopwatch.Elapsed.TotalSeconds:F1} seconds.");
+}
+
+static DifficultyLevel ReadDifficulty()
+{
+ while (true)
+ {
+ Console.WriteLine("Choose difficulty: 1. Easy (0-10), 2. Medium (0-50), 3. Hard (0-100)");
+ Console.Write("Difficulty: ");
+
+ switch (Console.ReadLine())
+ {
+ case "1":
+ return DifficultyLevel.Easy;
+ case "2":
+ return DifficultyLevel.Medium;
+ case "3":
+ return DifficultyLevel.Hard;
+ default:
+ Console.WriteLine("Please choose 1, 2, or 3.");
+ break;
+ }
+ }
+}
+
+static int ReadQuestionCount()
+{
+ while (true)
+ {
+ Console.Write("Number of questions (minimum 5): ");
+ if (int.TryParse(Console.ReadLine(), out int questionCount) && (questionCount >= 5))
+ {
+ return questionCount;
+ }
+
+ Console.WriteLine("Enter a whole number of at least 5.");
+ }
+}
+
+static MathQuestion CreateQuestion(
+ ArithmeticOperation operation,
+ int maximumOperand,
+ Random random)
+{
+ int firstOperand = random.Next(0, maximumOperand + 1);
+ int secondOperand = random.Next(0, maximumOperand + 1);
+
+ return operation switch
+ {
+ ArithmeticOperation.Addition => new MathQuestion(
+ $"{firstOperand} + {secondOperand} = ?",
+ firstOperand + secondOperand),
+ ArithmeticOperation.Subtraction => CreateSubtractionQuestion(firstOperand, secondOperand),
+ ArithmeticOperation.Multiplication => new MathQuestion(
+ $"{firstOperand} x {secondOperand} = ?",
+ firstOperand * secondOperand),
+ ArithmeticOperation.Division => CreateDivisionQuestion(maximumOperand, random),
+ _ => throw new InvalidOperationException("Unknown arithmetic operation.")
+ };
+}
+
+static MathQuestion CreateSubtractionQuestion(int firstOperand, int secondOperand)
+{
+ int largerOperand = Math.Max(firstOperand, secondOperand);
+ int smallerOperand = Math.Min(firstOperand, secondOperand);
+ return new MathQuestion(
+ $"{largerOperand} - {smallerOperand} = ?",
+ largerOperand - smallerOperand);
+}
+
+static MathQuestion CreateDivisionQuestion(int maximumOperand, Random random)
+{
+ int dividend = random.Next(0, maximumOperand + 1);
+ int[] possibleDivisors = dividend == 0
+ ? Enumerable.Range(1, maximumOperand).ToArray()
+ : Enumerable.Range(1, Math.Min(dividend, maximumOperand))
+ .Where(divisor => dividend % divisor == 0)
+ .ToArray();
+ int divisor = possibleDivisors[random.Next(possibleDivisors.Length)];
+
+ return new MathQuestion(
+ $"{dividend} / {divisor} = ?",
+ dividend / divisor);
+}
+
+static void ShowHistory(List gameHistory)
+{
+ if (gameHistory.Count == 0)
+ {
+ Console.WriteLine("No games have been completed yet.");
+ return;
+ }
+
+ Console.WriteLine("Game history:");
+ for (var index = 0; index < gameHistory.Count; index++)
+ {
+ GameResult result = gameHistory[index];
+ Console.WriteLine($"{index + 1}. {result.Mode}, {result.Difficulty}: {result.Score}/{result.QuestionCount}, {result.Elapsed.TotalSeconds:F1} seconds");
+ }
+}
+
+enum ArithmeticOperation
+{
+ Addition,
+ Subtraction,
+ Multiplication,
+ Division
+}
+
+enum DifficultyLevel
+{
+ Easy,
+ Medium,
+ Hard
+}
+
+record MathQuestion(string Prompt, int CorrectAnswer);
+
+record GameResult(
+ string Mode,
+ DifficultyLevel Difficulty,
+ int Score,
+ int QuestionCount,
+ TimeSpan Elapsed);