Anomaly 2 presents multiplayer for the first time in the series, pitting human-attacking convoys against stationary alien emplacements. The deciding factor in victory is points – the alien side must defend its generators and build harvesters to mine points away from the human side, while the humans aim to simply destroy every alien present.
It's a frantic tug of war as each side desperately scans the battlefield for vulnerability in the others' ranks. As the humans, ignoring harvesters, purchasing the wrong units or failing to sell and swap out units at integral times will easily spell death. The aliens have an arguably tougher job and lack the resources to build up defenses across the entire map, so it's more about predicting where the humans will go and taking care to build harvesters at the right time.