Dungeon of the ENDLESS puts you and up to three friends in a wrecked alien facility with one shared way out: carry the escape pod’s crystal to the lift on every floor. The game combines a room-by-room roguelike with tower defense and real-time hero management. You open doors to find resources, equipment, recruits, or monsters, then decide which rooms to power and where your heroes should hold ground. Your group is not racing another team or competing for a score; everyone is trying to get the same crystal upstairs before the dungeon tears it apart.
The run begins with a small crew and a powered room around the crystal. You do not see the full floor at once. A closed door hides what comes next, and opening it can uncover a useful room or release hostile creatures. Each door also advances the floor’s activity: resource modules produce their yield, characters may gain access to new supplies, and the map extends into another uncertain branch. A quiet stretch is not a promise that the next door will be quiet too.
Every door changes the map and the budget
Your crystal is both the thing you must protect and the source of Dust, the resource that powers rooms. Lit rooms stop monsters from spawning inside them, give your crew safe ground, and let you use the module slots found there. Dust is limited, though, so the whole map cannot stay bright. Powering one branch leaves other rooms dark, and those dark rooms can become new entry points for enemies. The floor gradually turns into a map of tradeoffs: a powered corridor can support a defensive line, while an unpowered shortcut may preserve Dust for the route to the exit.
Three more resources give each door a longer-term value. Food heals and levels heroes and can recruit a new one. Industry pays for modules such as turrets and resource generators. Science researches upgrades that improve what your structures can do. Major modules produce resources when doors open; minor modules provide the defenses and support that keep the next wave from reaching the crystal. Some rooms have more useful slots than others, and modules only work when their room has power. A workshop of turrets without a powered room behind it is decoration with a short life expectancy.
The doors are the game’s clock as much as its map. You can inspect the tactical layout and reposition heroes, but leaving more of a floor unexplored means more darkness remains behind you. Monsters may appear there and move toward your crystal, your modules, or an isolated hero. Some events alter the room or the way your crew has to respond. Weapons and armor found in chests or bought from merchants change the numbers and abilities of a hero, while equipment that suits one character may be a poor fit for another. Every new room can improve the plan or force the group to spend resources keeping it alive.
Finding the elevator is only the first half of a floor. To leave, one hero must pick up the crystal and carry it to the lift. That hero cannot fight while carrying it, and enemies pour out of unpowered rooms during the escape. The rest of the crew has to keep the path open, protect the carrier, and prevent the crystal from being destroyed. A group that spent its Dust on distant rooms can face a long final walk through dark territory; a group that left too much of the map untouched may be fighting a wave before it has a route. Reaching the lift carries the surviving heroes into another floor, with less certainty and usually more pressure.
Four players, four heroes, one escape
Online co-op supports two to four players, and the expedition has a hard cap of four heroes. Players can control one or more of those characters, so a smaller group can still manage the full squad. The game does not assign tank, healer, or builder classes to players. Instead, hero statistics, active and passive abilities, and equipment shape what each person can contribute. Some characters can repair damaged modules, some excel at fighting, and others bring abilities that help the crew move or survive. Characters can be transferred between players, so the person directing a hero can change as the run develops.
The group’s goals and map are shared, but its resource management is not one undifferentiated pile. The crystal, Dust, room power, and built modules belong to the common expedition. Food, Industry, and Science are tracked separately for each player, with production divided among the party; those supplies can be exchanged. Multiplayer research is shared, while the inventory is shared with a personal backpack for items set aside between floors. That arrangement gives each player decisions about spending and equipment while keeping the consequences tied to a single route and escape attempt.
Those systems make cooperation visible even when players are not standing in the same room. A hero can hold a powered area while another character opens the next door; someone repairing a damaged module can buy the crew time while another player moves toward an exit. But the game does not turn those actions into separate missions. The crew still wins or loses together: the crystal must reach the elevator, and losing the crystal or every hero ends the run. There is no competitive-versus mode mixed into the co-op campaign.
Multiplayer also keeps the action moving. There is no pause in co-op, so the group makes route and resource decisions while heroes and monsters continue to act. The game provides an in-game chat, but a long run can involve a lot of small choices: open another door for its resources, keep Dust for a safer route, spend Industry on a turret, or save Food for a recruit. That pace suits friends who like discussing a changing plan while the floor is still unfolding. It is less comfortable for a group looking for a relaxed, stop-and-start board-game pace.
A host-led lobby and a shared save
The PC version is built around online sessions rather than same-screen play. A host can create a private invitation-only lobby, make it friends-only, or open it to public players; a Steam friends invite is supported. The host starts the run and owns its save flow. If the group needs to stop, the host can save and quit during the strategic phase. Everyone receives the save, and one of the previous players can load it from the multiplayer menu and become the new host. Floor autosaves also give the host a way to reopen the run from the start of the current floor after a crash or disconnect. This is a deliberate save-and-rehost step, not a seamless handoff while the game continues.
Windows and macOS players can join the same multiplayer sessions. Controller support is partial; mouse and keyboard are the dependable baseline for moving heroes, opening doors, managing modules, and reading the tactical map. That control surface matters because a session can have several characters moving through different rooms while resource bars and module controls remain on screen. Windows and macOS support plus keyboard-and-mouse comfort are the practical setup checks for a group.
The group limit is the same four-hero limit that shapes a run, not four heroes per player. Two friends can each direct more than one character; four friends divide the crew more thinly. A public lobby can bring in players outside your friends list, but the main appeal is the shared campaign: players trade resources, pass heroes between them, and stay responsible for one map as the run changes.
New floors, new ships, familiar pressure
Dungeon of the ENDLESS gives each run a changing route through procedurally arranged rooms. Chests, resource deposits, merchants, recruitable heroes, hazards, and hostile encounters alter what a floor offers, while room layouts determine how many choices sit between the crystal and the elevator. The crew’s starting ship also changes the rules or resources of a run. Unlockable ships and heroes add different starting conditions and abilities, and the in-game album fills out details about characters, creatures, and the old civilization whose facility surrounds you.
That variety gives friends a reason to try another climb after a defeat. A different ship can change the opening economy; a new hero can alter who repairs, fights, or carries useful abilities; and a new floor layout makes the next door a fresh wager. The game’s progression is more about unlocking and learning its roster and starting conditions than keeping a permanently leveled party between all attempts. A failed run can feel costly because the full route begins again, but it also makes a successful crystal escape feel earned.
The setting mixes prison survivors, a lost alien civilization, and a malfunctioning facility full of creatures. The pixel-art rooms shift from metal corridors and old machinery to stranger, less familiar environments. Darkness is not just a visual filter: it hides routes and gives monsters places to appear. Character portraits and their small story details add a dry, sometimes odd note to a run that can otherwise become a serious resource puzzle. Music, lighting, and the exposed map keep the dungeon feeling both readable and uneasy: you can inspect the floor, but never know what the next doorway will add to it.
A tactical escape, with a real roguelike edge
The game’s strengths and frustrations come from the same loop. There is a satisfying chain from discovery to defense: a new room adds resources, Dust powers it, modules turn it into a safer or more productive space, and a hero’s equipment gives them a better chance of holding it. In co-op, those systems create useful exchanges between players and decisions with group-wide consequences. The escape phase then turns the map you have built into a route the crew must survive together.
The randomness can also create uneven runs. A valuable recruit or resource deposit might appear just when the crew needs one, while a bad door or a distant exit can make a floor feel punishing. The game can be demanding before its resource and room rules become familiar, and an unfamiliar hero’s strengths are not always obvious at first. Procedural layouts and ship variations add replay, but the basic cycle of opening doors, powering rooms, building modules, and carrying the crystal remains central. Some players enjoy learning how to stretch those systems across another attempt; others find the repeated floor structure and limited variety less rewarding once they have seen the main surprises.
For your group, Dungeon of the ENDLESS is a fit if you want a cooperative strategy run that gives each player a hero but makes the party answer for one shared escape. You share the crystal and powered map while managing individual resource accounts, hero equipment, and routes through a randomized dungeon. The hard part is not only keeping the heroes alive; it is deciding which risks your group can afford before the next door opens.