The sobosuba clean 4096 achievement in keepeetron's physics-driven merge puzzle sobosuba requires you to have a lone 4096 Sobo in the stack. Unlike high-score milestones, this challenge is strictly an arrangement test: you must assemble a 4096 blob so that it rests in the lower container with no other Sobos sharing the playfield. Successfully meeting this requirement unlocks the achievement along with an exclusive cosmetic color style.
What "Clean 4096" Means in sobosuba
In sobosuba, the playfield is split into two zones: the upper float bar where newly spawned Sobos arrive and wait, and the stack, which encompasses everything launched, dropped, or settled in the playfield below the bar.
To satisfy the clean requirement:
- A 4096 Sobo must exist in the playfield.
- No other blobs may remain in the stack at the moment the condition evaluates.
- Blobs resting safely on the float bar do not count as part of the stack, provided they have not descended into the container.
In earlier versions of the game, players on the Steam forums reported instances where clean achievements failed to register properly. Update 1.2.3 directly addressed this issue, with official patch notes confirming a fix for Clean achievements occasionally miscounting extra Sobos in the container.
sobosuba Clean Achievement Comparison
The clean challenge category features four distinct tiers. Global Steam statistics demonstrate a steep drop in completion rates as the target number doubles.
| Achievement Name | Exact In-Game Requirement | Steam Global Completion Rate |
|---|---|---|
| clean 512 | Have a lone 512 Sobo in the stack. | 46.4% |
| clean 1024 | Have a lone 1024 Sobo in the stack. | 38.9% |
| clean 2048 | Have a lone 2048 Sobo in the stack. | 22.0% |
| clean 4096 | Have a lone 4096 Sobo in the stack. | 12.4% |
Reaching 4096 requires combining two 2048 blobs, but leaving that final 4096 entirely isolated requires careful board management and deliberate merge sequences.
Key Mechanics for Clearing the Stack
Achieving a clean stack demands a playstyle fundamentally different from standard endless runs:
Space Recovery and Sizing
Each newly merged blob is roughly 1.28 times the size of the previous tier. Because a merged piece takes up significantly less total volume than the two pieces that created it, completing consecutive merges rapidly shrinks the stack footprint. To end with a lone piece, every lower-tier blob in the playfield must be consumed into the final combination.
Chain Alignment
Planning a continuous lineage is critical. Leaving stray 2s, 4s, or 8s stranded at the bottom of the container will invalidate the "lone" requirement when the 4096 forms. Players aiming for clean achievements set up cascades where the penultimate merges trigger sequentially, collapsing the entire lower pile into the single target blob.
Float Bar Interaction
The float bar is fully integrated into the physics simulation rather than being a static queue. Blobs on the bar can merge with one another before launch. Utilizing upper-bar merges allows you to build larger values before releasing them into the stack, minimizing the number of loose pieces introduced into the container.
Launch Precision and Cancelling
Update 1.2 added center cancelling, enabling you to abort an aimed shot by returning the aiming arrow toward the center. It also adjusted launches to inherit velocity from moving pieces. Using gentle, deliberate shots prevents stray blobs from ricocheting into unreachable corners.
Frequently Asked Questions
What does the clean 4096 achievement reward?
Unlocking clean 4096 awards the Steam achievement and unlocks one of the game's 30 selectable color styles.
Was clean 4096 bugged at launch?
Community members reported tracking discrepancies with clean stack achievements on release. Developer keepeetron resolved this in update 1.2.3, which fixed Clean achievements counting extra Sobos.
Can there be blobs in the float bar when clean 4096 triggers?
Yes. The requirement specifies having a lone 4096 Sobo in the stack, meaning the playfield container below the float bar must contain no other pieces.
