This project is an attempt to create a clone of Flappy Bird for the Nintendo Entertainment System. The project can be run through a NES emulator, such as FCEUX.

The assembler being used is the somewhat controversial nesasm assembler (I have version 2.51). Assuming nesasm is available on your $PATH, run the following to assemble the project:

cd src/
make

This will create the file flappy-bird.nes in the dist/ directory.

To make and run the project in one step, you can use make run, but you will need to have fceuxdsp on your $PATH. You could of course edit Makefile to use your preferred emulator if you wish.

Note: I had some difficulty locating the Linux version of nesasm recently, but found a copy as part of a dev kit here. Once you get the nesasm binary, ensure it's in your $PATH, and has execute permissions.

Inside the dist folder, you will find a flappy-bird.nes, which can be run using an emulator. I use, and have tested the ROM, with FCEUX.

For assembling the project yourself, see the section above.

The project so far:

• There is:
  • a start screen
  • background scrolling
  • an animated bird
  • gravity
  • ability to flap - press 'A'
  • a single pipe which scrolls with the background
    • this is implemented using sprites at present, but would be better if the background tiles could be swapped around - this would allow many more pipes (theoretically the entire screen could be filled with pipes).
  • a game over state, which is triggered when the bird wipes out by ploughing into the ground, or hits the pipe
• There is not:
  • sound
  • multiple pipes
  • title screen

• This project was created as a personal learning excercise
• The code is well commented, but I would advise against using it as a learning tool for NES development - I don't really know what I'm doing when it comes to NES development (or assembly for that matter), so there will be few (if any) occurences of best practices being used in the code.
• With the above in mind, a great resource for learning NES development is the popular Nerdy Nights tutorials
• Known issues:
  • there's a bug with the code that bounces the bird off the top of the screen - sometimes, the bird's downward speed will increase exponentially and cause it to slam into the ground