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Hubble Marble playtest
by zjinn
Build absurd marble combinations in a roguelike bubble shooter. Customize your collection, discover powerful Beads, and create score-exploding chain reactions through endless synergies.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Sep 23, 2026
- Planned release
- Coming soon
- Developer
- zjinn
- Platforms
- Windows, macOS
- Players
- Single-player
- Languages
- English, Simplified Chinese
How to join the Hubble Marble playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the Hubble Marble playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
How AI is used
This game uses generative AI as part of the asset creation process. Some artwork, textures, music, and sound effects were generated with AI-assisted tools and subsequently modified, curated, and integrated by the developer. All gameplay design, game systems, balancing, programming, and final implementation were created and controlled by the developer.
The developer's own words, from Steam.
About Hubble Marble
Hubble Marble is a roguelike bubble shooter where every run is shaped by the Marbles you collect, the Beads you string, and the synergies you build.
Match colors, trigger chain reactions, build powerful synergies, and chase massive scores as your humble collection evolves into a score-exploding machine.
Build Your Collection
Every Marble is more than a color.
Customize your collection with powerful Coats and Cores that dramatically change how marbles behave. Turn them into explosives, spread colors across the board, trigger effects multiple times, or bend the rules of matching entirely.
Discover Powerful Beads
Beads are the heart of every build. Some reward specific colors. Others reshape scoring, economy, matching rules, or board management. Stack synergies, exploit interactions, and create builds capable of generating enormous scores.
Adapt, Upgrade, and Refine Your Build
Visit shops between stages to expand your collection and shape your strategy.
Upgrade Colors, transform Marbles, purchase powerful Polishes, unlock permanent Licenses, and search for rare combinations that can completely redefine your run.
Every Run Tells a Different Story
Choose from different Professions and tackle unique Challenge Modes that dramatically alter how the game is played.
Start with specialized advantages, unique collections, or entirely new restrictions. Adapt to changing conditions, discover fresh strategies, and find new ways to push your build to its limits.
Features
• Roguelike bubble shooter gameplay with deep strategic progression
• Customize your collection through unique Marble Colors, Coats, and Cores
• Discover powerful Beads that reshape scoring, matching, and board management
• Upgrade, transform, and refine your build through Shops, Polishes, and Licenses
• Create game-breaking synergies and score-exploding combinations
• Choose from multiple Professions with distinct starting advantages
• Take on unique Challenge Modes that dramatically alter the rules
• Endless replayability through randomized rewards, builds, professions, and challenges
From the game's Steam page.
