diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 968baa9334c8909d20bf4884d82c72bd46a6c67e..5a8c8cef1ea628702cee4dabfc87ee4d089ebb36 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,2 +1,33 @@
-## Contributing
-Changes and improvements are more than welcome! Feel free to fork and open a pull request. Please make your changes in a specifically made branch and request to pull on `master`! If you can, please make sure the game fully works before sending the PR, as that will help speed up the process.
+# Contributing
+Changes and improvements are more than welcome! Feel free to fork and open a pull request.
+
+Please follow the house rules to have a bigger chance of your contribution being merged.
+
+## House rules
+
+### How to make changes
+ - To make changes, create a new branch based on `master` (do not create one from `gh-pages` unless strictly necessary) and make them there, then create a Pull Request to master.  
+ `gh-pages` is different from master in that it contains sharing features, analytics and other things that have no direct bearing with the game. `master` is the "pure" version of the game.
+ - If you want to modify the CSS, please edit the SCSS files present in `style/`: `main.scss` and others. Don't edit the `main.css`, because it's supposed to be generated.  
+ In order to compile your SCSS modifications, you need to use the `sass` gem (install it by running `gem install sass` once Ruby is installed).  
+ To run SASS, simply use the following command:  
+ `sass --watch style/main.scss`  
+ SASS will automatically recompile your css when changed.
+ - `Rakefile` contains some tasks that help during development. Feel free to add useful tasks if needed.
+ - Please use 2-space indentation when editing the JavaScript. A `.jshintrc` file is present, which will help your code to follow the guidelines if you install and run `jshint`.
+ - Please test your modification thouroughly before submitting your Pull Request.
+
+### Changes that might not be accepted
+We have to be conservative with the core game. This means that some modifications won't be merged, or will have to be evaluated carefully before being merged:
+
+ - Undo/redo features
+ - Save/reload features
+ - Changes to how the tiles look or their contents
+ - Changes to the layout
+ - Changes to the grid size
+
+### Changes that are welcome
+ - Bug fixes
+ - Compatibility improvements
+ - "Under the hood" enhancements
+ - Small changes that don't have an impact on the core gameplay
diff --git a/README.md b/README.md
index 19c6d0e011ecbbf40127c745354554645736a910..dac8af33f569331015a3d356eeb070818825c94b 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ Made just for fun. [Play it here!](http://gabrielecirulli.github.io/2048/)
  - [TimPetricola](https://github.com/TimPetricola) added best score storage
  - [chrisprice](https://github.com/chrisprice) added custom code for swipe handling on mobile
  - [elektryk](https://github.com/elektryk) made swipes work on Windows Phone
+ - [mgarciaisaia](https://github.com/mgarciaisaia) addes support for Android 2.3
 
 Many thanks to [rayhaanj](https://github.com/rayhaanj), [Mechazawa](https://github.com/Mechazawa), [grant](https://github.com/grant), [remram44](https://github.com/remram44) and [ghoullier](https://github.com/ghoullier) for the many other good contributions.
 
diff --git a/style/main.css b/style/main.css
index 5d10c6f22ab99a27f9726d5c0f5380a7ca99e85d..d6b7ce01263815b3009331c9c55c5989e9046b91 100644
--- a/style/main.css
+++ b/style/main.css
@@ -143,14 +143,15 @@ hr {
   padding: 15px;
   cursor: default;
   -webkit-touch-callout: none;
+  -ms-touch-callout: none;
   -webkit-user-select: none;
   -moz-user-select: none;
   -ms-user-select: none;
+  -ms-touch-action: none;
   background: #bbada0;
   border-radius: 6px;
   width: 500px;
   height: 500px;
-  -ms-touch-action: none;
   -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;
   box-sizing: border-box; }
@@ -554,14 +555,15 @@ hr {
     padding: 10px;
     cursor: default;
     -webkit-touch-callout: none;
+    -ms-touch-callout: none;
     -webkit-user-select: none;
     -moz-user-select: none;
     -ms-user-select: none;
+    -ms-touch-action: none;
     background: #bbada0;
     border-radius: 6px;
     width: 280px;
     height: 280px;
-    -ms-touch-action: none;
     -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
     box-sizing: border-box; }
diff --git a/style/main.scss b/style/main.scss
index 4403621beead441e7e6bab5ee0e2e03b388c902c..84e9021d641bc8c25bb3b21e4ace0fa5fad57d7b 100644
--- a/style/main.scss
+++ b/style/main.scss
@@ -176,15 +176,18 @@ hr {
 
     cursor: default;
     -webkit-touch-callout: none;
+    -ms-touch-callout: none;
+
     -webkit-user-select: none;
     -moz-user-select: none;
     -ms-user-select: none;
 
+    -ms-touch-action: none;
+
     background: $game-container-background;
     border-radius: $tile-border-radius * 2;
     width: $field-width;
     height: $field-width;
-    -ms-touch-action: none;
     -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
     box-sizing: border-box;