LEVEL
In the main interface, you will see a few circles with a number indicator in the middle of the circle.
This marks the levels in the game. Your current progress level should be highlighted with a golden light hue surrounding the circle.
Past levels that you already completed will turn grey, while future levels will have a striped road connection from your current level. You are not able to repeat a level that you already completed.
When you select an unlock level, the game will start.
SECTOR
Once you select a specific level, the game will first display how many sectors will there be in that level.
For example, sector 1 / 6 means that this is the first sector of 6 available sectors. 1 sector equals one battlefield map for you to play.
Different levels have a different amount of sectors available. You must win all available sectors to complete a level.