Dummy Defense Sphere Dummy: How to Unlock the Unit

The Sphere Dummy is a shop tower unlocked by defeating the Plague Doctor boss in Undead Mode, deploying as a defensive unit rooted in the lore of the ancient mediator faction. Clearing this encounter grants shop access, a tape, and a tag.

How Do You Unlock Sphere Dummy in Undead Mode?

Undead Mode is an expert difficulty challenge shipped in V1.29 that ends in the Plague Doctor confrontation. Clearing wave progression brings you face to face with the mode final boss, whose defeat awards the Defeat Plague Doctor badge. On the official Dummy Defense Roblox page, the developer defines the exact win condition:

Beat The Last Boss (Plague Doctor) in Undead Mode — official Roblox badge description

Earning this milestone registers three specific rewards to your account:

1. Shop availability for the Sphere Dummy tower.
2. A lore tape for playback on the lobby television.
3. A unique player tag.

The badge removes the store purchase gate. It does not place a free copy into your inventory, so you must still spend your in-game Bricks at the shop counter to finalize the acquisition. Per documentation in the community badges guide, the Defeat Plague Doctor milestone had recorded 17,814 earners by late October 2026, positioning it alongside late-game clears.

Starting matches in undead mode pits your setup against the Undead Faction. Wave 1 immediately tests perimeter lines with the Infected Dummy, an agile enemy with 13 HP that sprints directly down lanes using health-based offensive strikes. Surviving these incoming waves allows your squad to reach the Plague Doctor at the end of the match.

Dummy Defense badges are not trophies — they are the game's unlock system.

— Dummy Defense Badges: All 14 and What They Unlock

What Lore Role Do Sphere Dummies Play in the War?

Sphere dummies are an extinct race of peaceful mediators who vanished from the planet right before the alien invasions started. Prior to their disappearance, the planet was populated by distinct dummy races, including the intellectually oriented majority dummy group, the physically imposing scale tribe, and the teleporting block dummies in Asia. While the wedge faction fell during the first racial war and the aggressive cylinder tribe wiped itself out in the second racial war, the sphere population mysteriously disappeared from public view.

Lore details preserved in match archives suggest that the sphere faction retained deep connections to advanced defensive engineering. When the MK1 prototype Titan known as Frimmour fell during initial encounters with Goob, rumors circulated that the Sphere faction had revived the fallen mechanical defender to push back against the Guest faction.

Players who wish to explore these faction archives further can also pursue the sphere faction news tape. Unlike the combat requirement for the shop unit, that archival item triggers as a secret event while selecting the matchmaking menu.

Which Badge-Gated Shop Tower Should You Prioritize?

Badge-gated towers are specialized units that require specific combat or lobby milestones before the shop permits you to buy them. Dummy Defense uses its achievement list as a progression gating system, meaning levels and currency alone cannot unlock every unit in the armory. Earning badges opens access to specific faction defenders:

Choosing which path to complete first depends on match readiness. Finding lobby items for the MK1 titan dummy requires zero combat, making it accessible immediately upon entering the central area. Players looking to increase match pace can clear Controller Mode to earn the titan scale dummy while unlocking faster wave speeds. Once your squad handles high-intensity lane pressure, Undead Mode provides the final clearance needed to purchase the Sphere Dummy.

Where does this guide's official Dummy Defense information come from?

Official details in this guide follow Dummy Defense Codes – Get Free Bricks in Roblox, which describes the game in its own words.

Dummy Defense is a Roblox tower defense experience where players build powerful dummies to protect their base from increasingly difficult enemy waves.

Dummy Defense Codes – Get Free Bricks in Roblox