Hi, I’m Mike Booth, Chief Creative Officer at Bad Robot Games, and Game Director of 4:LOOP. In my last post, I shared how our core gameplay systems come together to create an unpredictable and endlessly replayable experience. Today, I’d like to share more details on one of our co-op shooter’s high-stakes boss fights. 

Specifically, I’d like to talk about how our team approaches designing these battles, and how these considerations led to one of our most unique enemies so far: The Scanner. 

No two bosses are alike

One of our main goals when designing bosses in 4:LOOP is making each of them unique – not only in their visual design, but in how they behave. We know we’re on the right track when a boss requires players to adopt new forms of cooperation, improvisation, and combinations of equipment and abilities. All of this results in the kind of creative problem solving at the heart of 4:LOOP. 

When we first started exploring the Scanner, or “The Cube,” as it’s called internally, I wanted to do something a bit different: create a boss battle that wasn’t about direct combat, but navigation, spatial awareness, and cross-map coordination. 

Keep moving to stay alive

For some of our boss battles, players can succeed by finding cover, hunkering down, and dishing out heaps of damage. But with the Scanner, that’s a sure-fire way to get yourself killed. 

Rather than attacking players directly, the Scanner emits a Laser Matrix over the entire map. This “Grid of Doom” (to use another internal name) is an interlocking grid of bright red and extremely dangerous lasers. One hit is enough to knock a player down. A second hit and you are out of the fight. 

The grid is slow moving and easy to see, making it manageable enough at the start of the encounter – and seemingly safe enough to lull you into a sense of complacency. But as the fight progresses, the laser grid becomes tighter and tighter, making navigation and survival increasingly difficult to manage. Of course, it’s not enough to just survive the Scanner. Players must destroy it to win. 

Your doom is six sided

Being a cube, the Scanner has six faces. On each of these faces, we’ve put nine destructible tiles, making 54 targets in total. To actually damage the Scanner, players must knock out all 54 panels at once, forcing the machine to reveal its vulnerable Reactor Core. 

Sounds straightforward enough… until the Scanner starts moving. 

We built the Scanner to constantly rotate and swap sections like a giant Cube Puzzle from Hell. On top of that, damaged panels reset over time. This creates a boss fight that requires players to spread out and attack from multiple angles, while navigating the Scanner’s ever-tightening Laser Matrix. 

All of this results in a unique gameplay challenge. Stay mobile enough to avoid the Grid of Doom, while remaining focused enough to knock out panels and coordinate a team-wide attack on the Reactor Core once it’s exposed. 

Hit the Scanner with everything you’ve got

Once all 54 tiles have been knocked out, the Scanner reveals its vulnerable Reactor Core for a brief window. This is the moment where the team - who could be on opposite ends of the map by this point - strike together as a cohesive unit to inflict as much damage as possible. 

The coordination that occurs in these brief windows are intuitive and natural. They emerge from the boss’s core design, rather than telling players what to do. 

Your choices matter

In 4:LOOP, we’re constantly trying to design gameplay moments that ask players to make interesting decisions - and then live with their consequences. The Scanner is no different. 

The game’s Probability Map makes it clear what boss you’ll be facing at the end of the Act. This forces players to think about what kind of gear and abilities to select leading up to the fight. Sure, shotguns are powerful… but they won’t be effective against the Scanner’s Reactor Core at range. Or maybe rather than taking that totally sweet Cloaking Backpack, you might want to choose equipment to help you navigate the Laser Matrix instead. 

Different by design

The Scanner is just one of several bosses in 4:LOOP, each built to push on players’ coordination, cooperation, and creative problem-solving skills. We hope all our bosses will generate crazy moments you’ll be talking about with your friends for a long time after you win or lose. 

The Scanner started from a simple image: A giant, floating cube puzzle with breakable panels. Over time, it grew into one of our most iconic enemies, and one that touches on almost every layer of how players can improvise to overcome overwhelming obstacles together. And it does all of this without firing a single shot at the players.

Ready to fight the Scanner?

See if you and your friends have what it takes to defeat the Scanner when 4:LOOP enters Closed Beta on PlayStation 5 and PC April 30. Sign up at play4loop.com to join Closed Beta Weekends, provide feedback, and experience new features and updates. Closed Beta will initially be available in North America, with plans to expand to additional regions at a later date.*

You can also join our growing community at discord.gg/4LOOP

*Closed Beta will be available to players in North America, in English, on PS5 consoles and PC (Steam). Access is limited, and registration does not guarantee entry.