diff --git a/aoc2020/bin/main.dart b/aoc2020/bin/main.dart
index 689fa21..abc9c4e 100644
--- a/aoc2020/bin/main.dart
+++ b/aoc2020/bin/main.dart
@@ -1,16 +1,27 @@
 import 'package:aoc2020/aoc2020.dart';
 import 'package:args/args.dart';
 
-// import 'package:aoc2020/aoc2020.dart' as aoc2020;
-
-// ignore: always_declare_return_types
 ArgResults argResults;
+
+const dayOption = 'day';
+const listOption = 'list';
+const runAllOption = 'runAll';
+const runLastOption = 'runLast';
+const testOnlyOption = 'testOnly';
 void main(List<String> arguments) {
   final parser = ArgParser()
-  ..addOption('day', abbr: 'd', help: 'Select the day')  //, callback: (day) => print('the day is aoc202012$day'))
-  ..addFlag('list', abbr: 'l', help: 'List available days', callback: (_) => aoc2020.list())
-  ..addFlag('runAll', abbr: 'r', help: 'Run all available days', callback: (_) => aoc2020.runAll());
+    ..addOption(dayOption, abbr: 'd', help: 'Select the day')
+    ..addFlag(listOption, abbr: 'l', help: 'List available days')
+    ..addFlag(runAllOption, abbr: 'a', help: 'Run all available days')
+    ..addFlag(runLastOption, abbr: 'r', help: 'Run last available day')
+    ..addFlag(testOnlyOption, abbr: 't', defaultsTo: true, help: 'Run last available day in test only');
   argResults = parser.parse(arguments);
-  // final paths = argResults.rest;
-  // print('paths: ${paths}!');
+  if (argResults[dayOption] != null) {
+  } else if (argResults[listOption]) {
+    aoc2020.list();
+  } else if (argResults[runAllOption]) {
+    aoc2020.runAll(testOnly: argResults[testOnlyOption]);
+  } else {
+    aoc2020.runLast(testOnly: argResults[testOnlyOption]);
+  }
 }
diff --git a/aoc2020/lib/aoc2020.dart b/aoc2020/lib/aoc2020.dart
index b176e8d..f0c4e83 100644
--- a/aoc2020/lib/aoc2020.dart
+++ b/aoc2020/lib/aoc2020.dart
@@ -1,8 +1,9 @@
+import 'package:aoc2020/aocbase.dart';
 import 'package:aoc2020/aoc20201201.dart';
+import 'package:aoc2020/aoc20201202.dart';
+import 'package:aoc2020/aoc20201203.dart';
 import 'dart:mirrors';
 
-import 'package:aoc2020/aocbase.dart';
-
 class aoc2020 {
   final String dayParam;
   final String subdayParam;
@@ -11,6 +12,8 @@ class aoc2020 {
 
   static List<AOCBase> aocDays = [
     AOC20201201(),
+    AOC20201202(),
+    AOC20201203(),
   ];
 
   static void list() async {
@@ -18,36 +21,32 @@ class aoc2020 {
     for (var index = 0; index < aocDays.length; index++) {
       var aocReflect = reflect(aocDays[index]);
       var classString = aocReflect.toString().split("'")[1];
-
       print('${index + 1} : ${classString ?? 'null'}');
-      // var myclass = aocDays[index];
-      // await myclass.a(test: true);
-      // await myclass.b(test: true);
-      // print('$index : ${myclass.answerA ?? 'null'}');
-      // print('$index : ${myclass.answerB ?? 'null'}');
-      // await myclass.a();
-      // await myclass.b();
-      // print('$index : ${myclass.answerA ?? 'null'}');
-      // print('$index : ${myclass.answerB ?? 'null'}');
     }
   }
 
-  static void runAll() async {
-    print('Days available:');
-    for (var index = 0; index < aocDays.length; index++) {
-      var aocReflect = reflect(aocDays[index]);
-      var classString = aocReflect.toString().split("'")[1];
+  static void runAt({AOCBase single, bool testOnly}) async {
+    var aocReflect = reflect(single);
+    var classString = aocReflect.toString().split("'")[1];
+    await single.a(test: true);
+    await single.b(test: true);
+    print('$classString A Test : ${single.answerA ?? 'null'}');
+    print('$classString B Test : ${single.answerB ?? 'null'}');
+    if (!testOnly) {
+      await single.a();
+      await single.b();
+      print('$classString A  : ${single.answerA ?? 'null'}');
+      print('$classString B  : ${single.answerB ?? 'null'}');
+    }
+  }
 
-      print('${index + 1} : ${classString ?? 'null'}');
-      var myclass = aocDays[index];
-      await myclass.a(test: true);
-      await myclass.b(test: true);
-      print('$classString A Test : ${myclass.answerA ?? 'null'}');
-      print('$classString B Test : ${myclass.answerB ?? 'null'}');
-      await myclass.a();
-      await myclass.b();
-      print('$classString A  : ${myclass.answerA ?? 'null'}');
-      print('$classString B  : ${myclass.answerB ?? 'null'}');
+  static void runLast({bool testOnly}) async {
+    runAt(single: aocDays.last, testOnly: testOnly);
+  }
+
+  static void runAll({bool testOnly}) async {
+    for (var single in aocDays) {
+      runAt(single: single, testOnly: testOnly);
     }
   }
 }
diff --git a/aoc2020/lib/aoc20201201.dart b/aoc2020/lib/aoc20201201.dart
index 1036a76..b679050 100644
--- a/aoc2020/lib/aoc20201201.dart
+++ b/aoc2020/lib/aoc20201201.dart
@@ -1,13 +1,10 @@
 import 'package:aoc2020/aocbase.dart';
 import 'package:aoc2020/model/readdata.dart';
-// import 'dart:mirrors';
 
 class AOC20201201 extends AOCBase {
   @override
   Future<void> a({bool test}) async {
     var filename = (test ?? false) ? classStringTest : classString;
-    print("Running 'a'" + ((test ?? false) ? 'with test' : ''));
-    print('$classStringTest');
     var mylist = await ReadData.readFileNum(filename);
     for (var index1 = 0; index1 < mylist.length - 1; index1++) {
       for (var index2 = index1 + 1; index2 < mylist.length; index2++) {
@@ -21,8 +18,6 @@ class AOC20201201 extends AOCBase {
   @override
   Future<void> b({bool test}) async {
     var filename = (test ?? false) ? classStringTest : classString;
-    print("Running 'b'" + ((test ?? false) ? 'with test' : ''));
-    print('$classStringTest');
     var mylist = await ReadData.readFileNum(filename);
     for (var index1 = 0; index1 < mylist.length - 1; index1++) {
       for (var index2 = index1 + 1; index2 < mylist.length; index2++) {
diff --git a/aoc2020/lib/aoc20201202.dart b/aoc2020/lib/aoc20201202.dart
new file mode 100644
index 0000000..d328106
--- /dev/null
+++ b/aoc2020/lib/aoc20201202.dart
@@ -0,0 +1,42 @@
+import 'package:aoc2020/aocbase.dart';
+import 'package:aoc2020/model/readdata.dart';
+// import 'dart:mirrors';
+
+class AOC20201202 extends AOCBase {
+  @override
+  Future<void> a({bool test}) async {
+    var filename = (test ?? false) ? classStringTest : classString;
+    var mylist = await ReadData.readFileString(filename);
+    var validPasswords = 0;
+    for (var index = 0; index < mylist.length; index++) {
+      var mysplit = mylist[index].split(' ');
+      var password = mysplit[2];
+      var testLetter = mysplit[1].split(':')[0];
+      var rangeCount = mysplit[0].split('-');
+      var minCount = int.parse(rangeCount[0]);
+      var maxCount = int.parse(rangeCount[1]);
+      var count = testLetter.allMatches(password).length;
+      if (count >= minCount && count <= maxCount) validPasswords++;
+    }
+    answerA = validPasswords;
+  }
+
+  @override
+  Future<void> b({bool test}) async {
+    var filename = (test ?? false) ? classStringTest : classString;
+    var mylist = await ReadData.readFileString(filename);
+    var validPasswords = 0;
+    for (var index = 0; index < mylist.length; index++) {
+      var mysplit = mylist[index].split(' ');
+      var password = mysplit[2];
+      var testLetter = mysplit[1].split(':')[0];
+      var rangeCount = mysplit[0].split('-');
+      var index1 = int.parse(rangeCount[0]) - 1;
+      var letter1 = password.substring(index1, index1+1) == testLetter;
+      var index2 = int.parse(rangeCount[1]) - 1;
+      var letter2 = password[index2] == testLetter;
+      if (letter1 ^ letter2) validPasswords++;
+    }
+    answerB = validPasswords;
+  }
+}
diff --git a/aoc2020/lib/aoc20201203.dart b/aoc2020/lib/aoc20201203.dart
new file mode 100644
index 0000000..38066ce
--- /dev/null
+++ b/aoc2020/lib/aoc20201203.dart
@@ -0,0 +1,54 @@
+import 'package:aoc2020/aocbase.dart';
+import 'package:aoc2020/model/point.dart';
+import 'package:aoc2020/model/readdata.dart';
+
+class AOC20201203 extends AOCBase {
+  static const tree = '#';
+
+  int indexWrap({int index, int width}) => index % width;
+  int treeTest({int index, String line}) {
+    var width = line.length;
+    var testChar = line[indexWrap(index: index, width: width)];
+    return testChar == tree ? 1 : 0;
+  }
+
+  int tobogganRide({List<String> hill, Point start, Point slope}) {
+    var numberOfTrees = 0;
+    var pos = start;
+    for (var lineNum = 0; lineNum < hill.length; lineNum += slope.item2) {
+      numberOfTrees += treeTest(index: pos.item1, line: hill[lineNum]);
+      pos = pos + slope;
+    }
+    return numberOfTrees;
+  }
+
+  @override
+  Future<void> a({bool test}) async {
+    var filename = (test ?? false) ? classStringTest : classString;
+    var mylist = await ReadData.readFileString(filename);
+    answerA = tobogganRide(hill: mylist, start: Point(0, 0), slope: Point(3, 1));
+  }
+
+  @override
+  Future<void> b({bool test}) async {
+    var filename = (test ?? false) ? classStringTest : classString;
+    var mylist = await ReadData.readFileString(filename);
+
+    var slopes = <Point>[
+      Point(1, 1),
+      Point(3, 1),
+      Point(5, 1),
+      Point(7, 1),
+      Point(1, 2),
+    ];
+    answerB = 0;
+    for (var slope in slopes) {
+      var trees = tobogganRide(hill: mylist, start: Point(0, 0), slope: slope);
+      if (answerB == 0) {
+        answerB = trees;
+      } else {
+        answerB *= trees;
+      }
+    }
+  }
+}
diff --git a/aoc2020/lib/model/aoc20201201.data b/aoc2020/lib/data/aoc20201201.data
similarity index 100%
rename from aoc2020/lib/model/aoc20201201.data
rename to aoc2020/lib/data/aoc20201201.data
diff --git a/aoc2020/lib/model/aoc20201201test.data b/aoc2020/lib/data/aoc20201201test.data
similarity index 100%
rename from aoc2020/lib/model/aoc20201201test.data
rename to aoc2020/lib/data/aoc20201201test.data
diff --git a/aoc2020/lib/data/aoc20201202.data b/aoc2020/lib/data/aoc20201202.data
new file mode 100644
index 0000000..6158f52
--- /dev/null
+++ b/aoc2020/lib/data/aoc20201202.data
@@ -0,0 +1,1000 @@
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+.#...##..#.
+..#.##.....
+.#.#.#....#
+.#........#
+#.##...#...
+#...##....#
+.#..#...#.#
diff --git a/aoc2020/lib/model/point.dart b/aoc2020/lib/model/point.dart
new file mode 100644
index 0000000..4566971
--- /dev/null
+++ b/aoc2020/lib/model/point.dart
@@ -0,0 +1,11 @@
+
+
+import 'package:tuple/tuple.dart';
+
+class Point extends Tuple2 {
+  Point(x, y) : super(x, y);
+  
+  Point operator +(Point other) {
+    return Point(item1 + other.item1, item2 + other.item2);
+  }
+}
\ No newline at end of file
diff --git a/aoc2020/lib/model/readdata.dart b/aoc2020/lib/model/readdata.dart
index 1ea9649..87afc38 100644
--- a/aoc2020/lib/model/readdata.dart
+++ b/aoc2020/lib/model/readdata.dart
@@ -1,8 +1,10 @@
 import 'dart:io';
 
 class ReadData {
+  static const prefix = 'lib/data/';
+
   static Future<List<String>> readFileString(String classString) async {
-    var fileName = 'lib/model/' + classString.toLowerCase() + '.data';
+    var fileName = prefix + classString.toLowerCase() + '.data';
     var file = File(fileName);
     var contents = <String>[];
 
@@ -16,7 +18,7 @@ class ReadData {
   }
 
   static Future<List<num>> readFileNum(String classString) async {
-    var fileName = 'lib/model/' + classString.toLowerCase() + '.data';
+    var fileName = prefix + classString.toLowerCase() + '.data';
     var file = File(fileName);
     var contents = <num>[];
 
diff --git a/aoc2020/pubspec.yaml b/aoc2020/pubspec.yaml
index 89a7252..ed8abae 100644
--- a/aoc2020/pubspec.yaml
+++ b/aoc2020/pubspec.yaml
@@ -7,7 +7,8 @@ description: A sample command-line application.
 environment:
   sdk: '>=2.4.0 <3.0.0'
 
-#dependencies:
+dependencies:
+  tuple: ^1.0.3
 #  path: ^1.6.0
 
 dev_dependencies: