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Duel 6 Reloaded


Duel 6 Reloaded is a cross-platform open-source last-man-standing 2D multi-player game. The game currently supports up to 15 players that can compete in 26 arenas. The arenas consist of solid blocks, moving platforms and water sections. Players are able to move through the environment using walking, jumping and crouching and use weapons to eliminate their opponents. There is a diverse set of 12 available weapons that differ in shot and reload speed, shot power and splash damage. In addition players can pick up various bonuses to boost their stamina and other characteristics. The number of rounds can be specified and the game collects player statistics during the gameplay such as number of wins, kills or accuracy. There are negative points for comitting suicide and drowning that discourage players from performing kamikaze attacks. The game features customizable player profiles and level editor.


The very first version of the game has been developed in 2002 by Ondrej Danek as a sequel to Duel 5 which was popular 2D deathmatch game published in a Czech computer magazine Level. Since then the game code has been continually improved and later open-sourced.

Technical overview

The game is written using the following technologies:

  • C++ with C++11, C++14, C++17 features
  • SDL 2
  • OpenGL (with a stable OpenGL 1 render backend and experimental OpenGL ES 2 and OpenGL 4 backends)
  • CMake

There is a builtin quake-style console that can be used to modify game aspects at runtime.

Supported platforms

The game has been tested on the following platforms:

  • MS Windows with Visual Studio 2017 and MinGW 64 compilers
  • Linux with GCC 7.1 compiler
  • Mac OS X with LLVM/Clang compiler

Recommended IDE:

  • CLion - Duel 6 Reloaded is supported by JetBrains


The game offers several customization options

Player profiles

Each player has its own set of skin colors and sounds for various game situations. These can be configured through JSON files located in player directory.

Level editor

Levels are saved in JSON format and there is an HTML5 level editor available in my GitHub repository that can be used to create new levels and modify the existing ones.


The game has built-in Lua scripting. More information about the API can be found in lua-scripting.txt.

Future plans and milestones

  • Computer opponents/bots - AI
  • Network play
  • Rewriting the remaining parts of original C code with global functions and variables using modern object-oriented code
  • Providing extension API for weapons, players and other game attributes
  • Collision detection and physics



Duel 6 Reloaded is BSD licensed.

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