The rules are simple: Like in normal FFA when you kill someone you get a point, in this mode you also steal all their points. Ther're 5 orb spawner on the map, after 1 minute they will spawn point orbs that give you points(their value is shown in top right cornergets bigger every minute). Orbs will spawn/change their position every 20 seconds.
You can also customize number of points needed for victory(from 100 to 500)
There is alternative mode where point orbs value changes randomly every 10 seconds.