MillionCube Opens Steam Page; 30-Player 3D Maze With Up to One Million Rooms Launches in Late October

PushForward has opened the Steam page for MillionCube, a 3D maze exploration game built around a straightforward objective on a potentially enormous scale: find one goal room hidden among as many as one million rooms. The store page went live on October 10, 2026 and is now accepting wishlists.

MillionCube can be played alone or online with up to 30 players. Door numbers, written characters and environmental details act as clues to the destination across four stages, ranging from a short introductory maze to a final challenge that the developer estimates could take hours or even days.

Quick Summary

• Title: MillionCube
• Japanese title: ミリオンキューブ
• Developer: PushForward
• Publisher: PushForward
• Platform: PC / Windows
• Store: Steam
• Steam App ID: 4553880
• Official press-release genre: 3D maze exploration adventure
• Steam genre: Adventure
• Steam genre: Casual
• Steam genre: Indie
• Mode: single-player
• Mode: online multiplayer / online co-op
• Online player count: up to 30
• Steam page opened: October 10, 2026
• Target release: late October 2026
• Steam currently lists: October 2026
• Schedule note: timing may change depending on Steam review
• Price: 880 yen including tax
• Status: unreleased
• Wishlist: available
• Main objective: find one goal room
• Maximum scale: 1,000,000 rooms
• Primary clues: numbers or characters written on doors
• Additional clues: scenery and objects inside rooms
• Hint system: numbers and environments provide signs as players approach the goal
• Action: very limited action elements
• Focus: exploration and searching
• Number of stages: 4
• Stage 1: Backrooms
• Backrooms: 1,000 rooms
• Backrooms code: 3 digits
• Backrooms estimate: around 10 minutes
• Stage 2: Aquarium
• Aquarium: 17,576 rooms
• Aquarium code: 3 letters
• Aquarium estimate: around 2 hours
• Stage 3: Cyberpunk
• Cyberpunk: 373,248 rooms
• Cyberpunk code: 3 Katakana characters
• Alternative Cyberpunk codes: other writing systems including kanji and Hangul
• Cyberpunk estimate: around 5 hours to several days
• Stage 4: Infinite Corridors
• Infinite Corridors: 1,000,000 rooms
• Infinite Corridors code: 6 digits
• Infinite Corridors estimate: around 10 hours to several days
• Avatar: robot named Cube
• Customization: body color
• Customization: expressions
• Customization: accessories
• Co-op item: teleport to friends
• Co-op item: identify teammates close to the goal
• Treasure chests: may contain items or traps
• Lobby: includes a slot system
• Slots: also playable after reaching the goal
• Steam Achievements: supported
• Steam Cloud: supported
• Family Sharing: supported
• Interface languages: 19 listed on Steam
• Streamer mode: available
• Streamer mode: can hide player names
• Streamer mode: can hide chat
• Streamer mode: can mask inappropriate room names
• Streaming: no permission required
• Video/stream monetization: allowed
• Copyright notice for streams: not required
• AI disclosure: some assets were made with generative AI assistance
• Developer statement: AI-assisted assets were reviewed, edited and integrated by the team
• Minimum storage: 10 GB
• Minimum RAM: 16 GB
• Minimum GPU: GTX 1060 6 GB / RX 580 8 GB
• Recommended RAM: 32 GB
• Recommended GPU: RTX 3060 / RX 6600 XT
• Recommended target: 1080p / 60 FPS at default settings
• Official trailer: approximately 53 seconds

MillionCube Trailer, Steam Page and Gameplay

One Goal Hidden Among Up to a Million Rooms

MillionCube does not expect players to memorize an entire maze. Each door carries a number or set of characters, while the surrounding scenery provides additional information about the destination.

The closer players move toward the goal, the stronger those signals become. That turns exploration into a process of reading patterns rather than simply choosing doors at random.

Four Stages Scale From 1,000 to One Million Rooms

Backrooms serves as the introduction with 1,000 rooms and an estimated completion time of roughly 10 minutes. Aquarium raises the count to 17,576, while Cyberpunk contains 373,248 rooms with more irregular layouts and door placement.

The largest challenge is Infinite Corridors, a Japanese-architecture maze containing one million rooms and spaces designed to disrupt the player's sense of up, down, left and right.

Cooperate or Race With Up to 30 Players

Online multiplayer supports as many as 30 people. Groups can split up to search more efficiently, cooperate through special items, or simply race to see who reaches the goal first.

Cube, the player avatar, can also be customized, while the lobby and post-goal area include a slot system for players waiting on the rest of the group.

Built With Streamers in Mind

PushForward includes a streamer mode that can hide player names and chat while masking potentially inappropriate room names.

The developer also allows streaming and video creation without prior permission, including monetized content, and does not require a copyright notice in descriptions.

Why This Matters

1) The scale changes dramatically between stages

The game begins with 1,000 rooms before eventually escalating to a million-room final maze.

2) Multiplayer changes how the search can be approached

Thirty players can divide the maze between them or turn the same objective into a race.

Game Ad

429 - Four Twenty Knight

3) Its rules are particularly friendly to content creators

Streamer mode and permissive video guidelines make long sessions easier to use for livestreams and edited videos.

MillionCube Game Information

For now, the additional important information currently known includes:

• MillionCube is a new game from PushForward
• the developer is also known for Minna de Suiri
• the accessibility and multiplayer approach of its previous game helped shape MillionCube
• the Steam page opened October 10, 2026
• the official press release was published October 11, 2026
• wishlisting is available
• the target launch window is late October 2026
• Steam review timing may affect the actual date
• Steam currently lists only October 2026
• the announced price is 880 yen including tax
• PC / Windows via Steam is the only announced platform
• no console version has been announced
• single-player is supported
• online co-op is supported
• multiplayer supports up to 30 players
• each stage contains one goal
• stages consist of large networks of connected rooms
• door numbers or characters provide clues
• environmental visuals also provide clues
• hints change as players approach the destination
• each stage has a special finale
• Backrooms contains 1,000 rooms
• Backrooms uses three-digit codes
• Backrooms is positioned as the introductory stage
• its estimated completion time is about 10 minutes
• Aquarium contains 17,576 rooms
• Aquarium uses three letters
• the types of fish inside the aquarium can act as clues
• its estimated completion time is around two hours
• Cyberpunk contains 373,248 rooms
• Cyberpunk uses a neon-lit city environment
• rooms and doors are placed less consistently
• its default room codes use three Katakana characters
• room codes can switch to other writing systems
• kanji and Hangul are specifically mentioned
• Cyberpunk is estimated at five hours to several days
• Infinite Corridors contains one million rooms
• it uses six-digit codes
• its environments draw on Japanese architecture
• the maze deliberately disrupts spatial orientation
• its estimate is around 10 hours to several days
• the player avatar is a robot named Cube
• Cube's body color can be customized
• expressions can be customized
• accessories can also be equipped
• some items let players teleport to friends
• another item helps identify a teammate closest to the goal
• treasure chests may contain traps
• a slot system is available in the lobby
• slots can also be played after reaching the goal
• slot rewards may provide useful in-game items
• the game contains very little action
• Steam lists Steam Achievements
• Steam lists Steam Cloud
• Steam lists Family Sharing
• Steam lists 19 interface languages
• Indonesian is not currently listed among the supported Steam languages
• Japanese and English interfaces are available
• no full-audio support is listed
• streamer mode is included
• player names can be hidden
• chat can be hidden
• inappropriate room names can be masked
• developer permission is not required for streaming
• monetized streams and videos are permitted
• copyright notices are not required
• launch plans include a bundle sale with Minna de Suiri and Minna de Umigame no Soup
• Steam states that some assets were created with generative AI assistance
• PushForward says all AI-assisted assets were reviewed and edited by the team
• minimum OS is Windows 10 64-bit
• minimum CPU is Intel Core i5-6600 / AMD Ryzen 3 1200
• minimum RAM is 16 GB
• minimum GPU is GTX 1060 6 GB / RX 580 8 GB
• minimum storage is 10 GB
• broadband internet is required for multiplayer and leaderboards
• recommended CPU is Intel Core i5-10400 / Ryzen 5 3600
• recommended RAM is 32 GB
• recommended GPU is RTX 3060 / RX 6600 XT
• an SSD is recommended
• the recommended target is 1080p / 60 FPS at default settings
• the game page is available through Steam
• official footage is available through the Official Trailer
• developer information is available through the PushForward Official Website

Closing

MillionCube takes the simple idea of finding one destination and scales it into a maze containing as many as one million rooms, playable alone or with up to 30 people dividing the search.

PushForward is targeting a late October 2026 release at 880 yen. The exact date remains dependent on the Steam review process, while the store page and wishlist are already live.