Players can pilot the long-awaited mech suit, slaying enemies with machine gun fire or shooting down dropships with rockets.
Suicide Squad and Skull and Bones entered the monthly charts at No. 4 and No. 8 respectively, seeing disappointing sales.
Helldivers 2 players will have to work hard in order to bring usable mech suits into the game, thanks to the new major order.
A new Warbond, dubbed Cutting Edge, will go live next week, bringing more new content to the co-op shooter.
The patch also makes several balancing adjustments, while also making Eradicate missions twice as long as before.
The Helldivers 2 studio hasn't been acquired by Sony Interactive Entertainment, contrary to some recent rumours.
After all the rumours and datamining, the EX-45 Patriot Exosuit is finally a confirmed player-controlled mech coming to Helldivers 2.
In a rare occurrence for video game sales, Helldivers 2's sales in the US rose in its third week, after having also risen in its second.
Gameplay clips have emerged online, showing a variety of new vehicles that some players have already managed to get their hands on.
The two surprise hits of this quarter have also had extensive development periods but showcase a fundamental difference in their approaches.
Some players have managed to get their hands on mech, even though they haven't yet been officially added into the game.
Arrowhead is also investigating issues like Personal Orders not appearing, Light/Medium/Heavy armor sets not working as intended and more.
Despite multiple server issues, big-name competitors and a live-service approach, Arrowhead's shooter continues to pull in players.
"Inverse decays are rare, this large a week two jump even more so, especially outside the Holiday window," says Circana analyst Mat Piscatella.
A Medic Backpack, Mini Missiles and Nuke are reportedly being added, while the Illuminate will allegedly have new units.
Sales for the co-op shooter are up by 20 percent in its third week. Meanwhile, Mario vs. Donkey Kong and Skull and Bones sales are down.
The studio's CEO Johan Pilestedt teased a massive new milestone after initially announcing almost one million units sold.
Arrowhead Game Studios CEO Johan Pilestedt says the development team is ready to "resume our original plan" for post-launch content.
Helldivers 2's server woes are slowly being addressed by its developer as it prepares for a big influx of players over the weekend.
Helldivers 2 was made using a game engine for which support had ended back in 2018—Autodesk Stingray.
