Gamemodes are the core parts of gameplay within R2DA. These dictate specific instructions that the survivors must perform to win rounds, at all the while zombies are trying to stop them. Most of these play off the typical "survivor versus zombie" with slight adjustments, but there is some "player versus player" thrown into the mix. You can vote for these by pressing tab in-game, select map, gamemode, and some maps even have skybox.

The main page can be found here.