This is the home page for Quadrupleback, a video game where intruders must be circled (see the screenshot). It is a clone of the 1982 Doubleback game by Dale Lear for the Tandy Color Computer.

Quadrupleback 0.2.0 is out (2024-05-25). This version is based on flatzebra 0.2.x and SDL2. The full screen mode now shows the correct aspect ratio.

Requirements (on a GNU/Linux system): SDL2, SDL2_image, SDL2_mixer, SDL2_gfx, SDL2_ttf. The sources might compile on other Unix-like systems.

Download

You need to get quadrupleback and flatzebra.

Package	Version	Source	Ubuntu 20.04 package	Ubuntu 20.04 development package
quadrupleback	0.2.0
flatzebra	0.2.0
flatzebra-dev	0.2.0
burgerspace	1.10.0
cosmosmash	1.5.0
afternoonstalker	1.2.0
batrachians	0.2.0

SHA512 signatures of these files.

The sources are in C++ and can be compiled and installed with the familiar ./configure && make && make install sequence.

License

Quadrupleback and the flatzebra library are free software released under the GNU General Public License, version 2 or later.

SDL2 is a free library distributed under the GNU Lesser General Public License.

Documentation

Game Play

You should see an entry for Quadrupleback in the Games menu. The command quadrupleback runs the game.

You control the blue snake that starts at the center of the screen. Move it with the keyboard arrows or with the left joystick of an Xbox 360 controller (or compatible).

The object of the game is to score points by making the snake circle the other objects. However, the snake must never touch those objects, or you will lose a life.

More points can be scored by circling more than one object at a time. In such a case, the number of points scored is the point value of all the circled objects, multiplied by the number of circled objects.

To move more slowly, press the Control key, or the gamepad's A button.

The F11 key toggles full-screen mode. The Escape key quits the game.

The game is very similar to Doubleback, but does not aim to be an exact clone. A Color Computer user has released a short demo of Doubleback (2'53") on YouTube.

Contact

I can be reached (in French or English) by email at sarrazip at sarrazip dot com. My main Web page is Pierre and his Poor Pathetic Page (or La Petite Page Plate de Pierre in French).