If you're a big Nintendo fan then Nescube is one phone app that you can't afford to be without. This excellent emulator allows you to play old NES games on your cellphone for free. It works by loading ROMs, which are games files in .nes format containing all the data of the original game. You can download these files or use existing ROMs that you own. The compiled Nescube emulator comes with one preloaded game called Bonk's Adventures.

How to create Nescube game:
1. Download Nescube
2. Extract file nescube12_package.rar
3. Add your ROMs to nes folder
4. Run Make Nescube Full
5. Enjoy your game

Download Nescube here

MeBoy is a Gameboy/Gameboy Color emulator for mobile phones (which means you can use it to play Gameboy games on a mobile phone). It works on phones with support for Java Micro Edition, specifically MIDP 2.0. Your phone manufacturer's web site can tell you if this includes your phone.

How to create MeBoy game:
1. Make sure you have Java installed on your computer, version 1.5 or later
2. Download and run MeBoyBuilder.jar
3. Press the "Add game" and select a ROM file. Repeat for all games you want to add (beware that some phones do not accept very large ".jar" files though
4. Press the "Create MeBoy.jar" button. Select where to create MeBoy.jar
5. Copy MeBoy.jar to your phone. If the phone accepted the file, you're done

Download the latest version of MeBoy here