Instructions
Click "Single-Player" from the game's main menu. Another list of options will be displayed, all of which relate to its single-player game components.
Click "Custom Match" from the available options. A new window will appear, allowing you to customize the parameters of the match.
Click the "Map" tab on the right side of the screen. The in-game explorer will appear, allowing you to look for the map you want to play.
Click the custom map you want to play and click "Select" from the window. The map will now be selected.
Click the "Match Options" tab on the right side of the screen. Several options relating to the game type and number of robots in the match will be listed.
Click the drop-down box "Number of Players" and click the desired number of robots. Once chosen, click "OK" at the bottom of the window. You will return to the match's central hub.
Click the "Play" button at the top-right of the screen to begin playing the custom map with robots.