# Chicken Invaders: Revenge of the Yolk

Introduction

Chickens.

For centuries we have oppressed them, grilling, roasting, stewing, broiling, and stuffing them in buns. We should have known the time would come for us to pay. And it did.

Intergalactic chickens invaded Earth, seeking revenge for the oppression of their earthly brethren. They came out of nowhere, and everywhere. It was only you who managed to repel the invasion, and saved humanity from an eternity of servitude.

Then, things got serious. The intergalactic chickens assaulted the solar system and tried make sure that every planet was inhabited exclusively by chickens. Yet again, it was you who took the world's fate in your ketchup-stained hands and saved the day.

But it isn't over yet. Once more, it's time to don your teflon-coated, egg-repulsing helmet and fight for our ancestral right to omelettes. Only you can make a difference. Will you succeed? Will the future of chicken burgers be secure? Or will you end up as part of the menu in a galactic chicken restaurant?

Playing the Game

The basic game mechanics are very simple:

1. Clear each wave by destroying chickens and other appearing enemies.
2. Avoid falling eggs and other enemy projectiles.
3. Collect gifts and powerups to upgrade your spaceship weapons.
4. Collect falling food items to earn missiles.

That's it! It may sound simple but (as you'll soon discover) simple things aren't always easy! Those chickens have got a few tricks up their proverbial sleeves that will keep your hands full from the very beginning. Good luck!

The Game Screen

Most of what you see while playing the game proper is taken up by a view of your fight against the chickens. Along the edges of the screen you'll also be able to find useful information about the game status:

Score area (top-left)
  This area displays your score. The heat level of your current weapon is also shown next to your score.
Status area (bottom-left)
  This area displays a series of informative icons related to your status. From left to right, these are: your remaining lives (heart icon), your remaining missiles (rocket icon), your current weapon level (lightning icon), and collected food items (drumstick icon).
System area (bottom-right)
  This area displays system messages. The last message is displayed highlighted, along with the previous 3 messages. When there are no new messages to display, this area will slowly disappear.

Options

Game options can be accessed by clicking on the "Options" button from the main menu. Options are organized in the following categories.

Gameplay

In-game help
  Displays tutorial, help messages, and tips while you play.

Controls

Controls can be re-defined in this menu. The default controls are as follows:

Arrow keys or mouse movement
  Fly around.
SPACE or left mouse button
  Fire.
ENTER or right mouse button
  Launch missile.
ESC or PAUSE key
  Brings up the in-game pause menu.
Ctrl-Alt-X
  Use this key combination to immediately quit while you're in a game.

You can also set the keyboard sensitivity here, which controls how fast your keyboard/joystick/gamepad reacts to button presses. Low values will cause your spaceship to move more smoothly, while high values will allow for rapid changes in direction. Experiment with different settings until you find the one you're most comfortable with.

Graphics

Detail (fastest setting: Low, best setting: High)
  Controls the overall level of graphical detail and special effects in the game. Set this to "low" if the game runs slowly on your computer.

In addition to the detail setting, there are more options that you can tweak to maximize the game's performance (you can also visit the website for an in-depth guide on how to run the game as fast as possible). These can be found in the "Advanced" area:

Video Mode (fastest setting: 640x480, recommended setting: 800x600)
  Selects the game resolution. The game's native resolution is 800x600 (all the graphics have been optimized for this resolution) and setting the resolution higher may make the game run a lot slower. However, higher resolutions will allow more details to be clearly seen. If your hardware does not support the requested resolution, it will just be ignored.
Full Screen (fastest: On, recommended setting: On)
  Selects whether the game will run in full screen (recommended), or in a window on your desktop. Some graphics cards run much faster when in full-screen, while others run better when windowed. Experiment!
V-Sync (fastest setting: Off, recommended setting: Off)
  Selects whether each frame will be synchronized with your monitors vertical refresh signal. Setting this option on will make the frames smoother, but will limit your maximum frame rate (typically to 60 or 75 frames per second). Turn it off to make the game run faster.
Maximum fps (fastest setting: 400, recommended setting: 100)
  This puts a limit to the maximum frames per second (fps) of the game. There is generally no need to lower this from the default setting unless you want to free up processor time for other tasks running in the background. In any case, it's not recommended that you set this below 40 fps. Setting it too high will result in an uneven frame rate and may cause your sound output to stutter on some configurations.
Bilinear Filter (fastest setting: Off, recommended setting: On)
  This turns bilinear filtering on or off. Bilinear filtering significantly improves the smoothness of graphics, however it does slow things down on older computers. It's only recommended to turn this off if you are running the game on a very slow computer.
Show fps
  Enabling this option will show your current frames-per-second (fps) at the top-right of the screen.

Sound

Quality (fastest setting: Low, recommended setting: High)
  There is normally no need to change this from the default "high" setting. Try setting it to "low" on very slow computers, and only after you have tweaked your graphics settings first. You can also set it to "very high", although the difference in quality will be negligible. This option requires quitting the game and restarting it before it takes effect.
In-game music
  Turn this on to have music play while you're playing the game. Note that turning this off will still play music during the introduction and while in the menu.
Sound volume
  Controls the sound effects volume.
Music volume
  Controls the music volume.