B20 Stress Test
A downloadable game for Android
A little robot. Forty quick challenges.
Meet B20, a small robot with a very busy day. Put your reflexes, memory, and timing to the test in bite-sized microgames, from unpredictable laboratory experiments to everyday city chaos.
Free Android early access. Download the APK below and help shape the next version with feedback on controls, instructions, difficulty and performance.
What's in this build?
- 40 playable microgames across Mad Experiments and Urban Daydream: 20 in each theme.
- Quick touch-based challenges with five difficulty levels.
- Regular runs, focused challenges and an endless mode.
- Stars, achievements and daily challenges.
- 12 selectable interface languages. Translations are still being refined.
- No advertisements or in-app purchases.
Additional theme previews are not playable yet. Showcase images are AI-assisted promotional composites based on English Unity Editor gameplay captures, not unmodified device screenshots. Interface details may change.
Android download — version 1.0.0 (build 5)
September 14, 2026 build · approximately 242 MB. Requires Android 6.0+ and a 64-bit ARM (arm64-v8a) Android system. This is an installable APK, not a browser game. Compatibility with every device is not guaranteed.
Download the APK on your Android device and open it. If prompted, allow installation for the browser or file manager you used, then revoke that permission afterward. Keep device security protections enabled. Try updating an existing installation without uninstalling; uninstalling or clearing app data can erase local progress. Contact support if installation fails.
Early-access notes
This is a work-in-progress release. Physical Android device coverage is not yet available; broader compatibility, service testing and translations will continue after release. Test progress may change or be reset. The ranking screen currently includes simulated opponents. This download is separate from Google Play's closed-testing program and does not count toward it.
Your choices and privacy
The game asks for an age range each launch. Players under 13 cannot proceed; ages 13–17 use local play only. Adults choose whether to enable online services. Optional gameplay analytics and crash reporting have separate choices, initially off, in Settings. Declining reports does not disable online account or cloud-save processing when you choose online play.
Game-account deletion is available in Settings → Account & data. Historical Firebase reports and your separate Unity Player Account are handled separately. For requests, errors or help, use the support page or email the developer.
Privacy policy · Terms of service · Support and data requests
Help improve B20
Were any instructions confusing or controls difficult? Leave a comment or email tigerywy@gmail.com with your device model, Android version, game version and steps to reproduce a problem. Remove personal information from screenshots. Never send passwords, authentication tokens or verification codes.
Developed by Vic Yang. Visual assets and the showcase include AI-assisted/generated artwork.
Download
Install instructions
Android 6.0+ with a 64-bit ARM Android system is required. Download the APK and open it on your Android device. If prompted, permit installation for the browser or file manager you used, then revoke that permission afterward. Keep device security protections enabled. Update an existing installation without uninstalling where possible; uninstalling can erase local progress. Early-access build: compatibility is not guaranteed on every device. Support: tigerywy@gmail.com.
Comments
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Android Update 1.0.0 (7)
This update retunes the difficulty and pacing of several minigames, refreshes selected artwork, and improves audio, navigation, and save selection.
## Gameplay & Difficulty
- **Absolute Defense:** Missiles now launch continuously on a timed schedule, each with its own defense window. Higher difficulties challenge you to handle multiple missiles at once.
- **Mosquito Mayhem:** Face 1–5 independently moving mosquitoes depending on difficulty. Each mosquito takes one hit to defeat—swat them all to win, with new squash feedback on each hit.
- **Dog Cleanup:** The dog-cleaning minigame has a new name. Scrub muddy spots back and forth, and watch for gentle dodges on higher difficulties. The towel now follows closer to your finger.
- **Balloon Panic:** Retuned target zones and improved the pressure gauge. Releasing too early quickly deflates the balloon, but you can press again to keep going. Releasing in the red zone pops it; reaching full pressure still causes an automatic pop.
- **Memory Route:** Refreshed neuron, connection, and highlight artwork, retuned difficulty progression, and changed obstacles to fixed positions.
- **More balance changes:** Retuned objectives, timing windows, or pacing across station docking, quality inspection, shrinking toys, grabbing fries, closing pop-ups, cleaning fingerprints, and balancing deliveries. Higher difficulties offer new challenges, with adjustments to several difficulty curves.
## Fixes & Improvements
- Fixed the ceiling spikes not following camera movement correctly in Dive Experiment, so descending can create distance from them. Also adjusted their pursuit pacing.
- Fixed fish and their target silhouettes facing different directions in the time-freezing minigame.
- Improved the shrinking beam's alignment, the fit of coffee inside the cup, and the placement of selected scene elements.
- Restored the happy bark in Dog Cleanup, playing it before the victory cue. Balloon pops now also play before the failure cue to avoid being cut short.
- Leaving a run started from a theme or Endless Mode now returns you to the corresponding entry screen.
## Accounts & Saves
When an account already has cloud progress, a new comparison and confirmation flow lets you review the local and cloud saves before choosing. Keeping local progress is available when eligible; low-level local saves cannot overwrite higher-level cloud progress. Saves are not automatically merged, so please review your choice carefully.
Thanks for playing! We'd love your feedback on the updated difficulty and controls. When reporting an issue, please include the minigame, difficulty, device model, system version, and steps to reproduce it.