As its name states, it is a mode focused on short rounds of around 10 to 15 minutes.
The player gets to choose between 3 different companies:
Round Mode can provide the players with 3 different objectives, a Transaction, an Acquisition and a Double Disk.
(To avoid confusion, in these examples teams will be referred to by numbers, not by their names.)
Team 1 is provided with a randomized amount of money. Team 2 is provided with a disk. Team 3 is provided with either money, not necessarily the same amount as Team 1, or, with no money. Receiving no money during a transaction is commonly known as having "any means", due to the game stating that you have to obtain the disk by "any means necessary"
The players are then left on their own, they can set up a deal, call the other team and say mean, unprofessional things over the phone or deposit the goods right away, preventing the deal from ever happening.
Acquisition missions are always given to either only one team, or all three. Up to three limousines can spawn, which the players have to hunt down and kill the driver, which will then drop a briefcase with the disk inside. All the teams can be fighting over one disk, two teams can be fighting over one, or everyone can have their own.
Team 1 is provided with a disk. Team 2 is provided with a second disk, of the same color. Team 3 is provided with money. The players then are to set up a deal, where Team 3, in most cases, will buy both of the disks from Team 1 and Team 2. Buying only one disk will not yield any profits. Generally, this objective is, in practice, the most peaceful as there is no competition here. Despite this, a lot of high risk, high reward stunts can be pulled off. Team 3 could kill both Team 1 and Team 2 to keep the money and also receive the payout from the disks, or Team 1 could kill Team 2 (Or vice versa.) to sell two disks and earn a larger sum of cash. This objective bares extreme similarities to a transaction objective.