Spongebob Tower Defense is about to change in a big way. For the first time ever, players can obtain a strictly free Prismatic unit without spending Robux or relying on paid bundles. This update introduces a brand-new boss battle system, exclusive rewards, and a clear path for free-to-play players to compete at the highest level.
If you are wondering how to get this free Prismatic, what you need to prepare, and which units actually matter, this guide breaks everything down in a simple and practical way. Also check out our Spongebob Tower Defense Codes for more rewards!
How the Free Prismatic Works
The free Prismatic is tied directly to the new Boss Battle Mode. In this update, players will face 16 new bosses, each one stronger than the last. If you manage to clear all 16 bosses, you gain a chance to receive an exclusive Prismatic unit drop. Important points to understand:
- This Prismatic is 100% free-to-play
- There is no game pass or bundle that guarantees it
- You cannot buy it with currency
- The only way to get it is by clearing all bosses
Because this unit is exclusive and cannot be purchased, its value is expected to be very high, especially now that duplication issues have been fixed.
Understanding Boss Battle Mode
Boss Battle Mode in Spongebob Tower Defense works differently from standard tower defense gameplay. It functions more like an AFK damage simulator. Key mechanics:
- You cannot place units manually
- You cannot activate abilities
- You press start, then replay repeatedly
- Damage output is calculated automatically
Boss health scales heavily. Early bosses may have around 70 million HP, while later bosses can reach 1.5 billion HP or more. Future scaling could push this even higher, making preparation extremely important.
Best Strategy to Clear All 16 Bosses
To clear all bosses efficiently, you do not need a full team of exotic or superstar units. Testing shows that two strong Prismatics plus the right pets outperform large teams. Core Units You Should Use:
- Square Pants (Prismatic)
- Snow Sponge (Prismatic)
Even low-level versions of these units can deal massive damage. Superstar levels are helpful but not required, especially for alternate accounts.
Pets That Matter the Most
Pets are more important than extra units in boss battles because of placement bonuses and buffs.
Recommended Pets
- Las Spatula: +2 placement
- Swashbuckler / Potty / Cursed Jelly: +1 placement
- Jellyfish Jam: Buffs attack speed (SPA) of nearby units
Pet levels and stars do not matter. You only care about:
- Placement bonuses
- Passive buffs
Using Jellyfish Jam on your weakest unit still boosts your entire team, which becomes critical as boss HP increases.
Best Traits to Use
Traits significantly impact damage output, even in AFK boss battles.
- Seabear
- Sidekick
This combo is currently the strongest overall setup. Apply it to both Prismatics if possible. Even without max levels, this trait setup provides a major advantage.
Cheap Team Setup for Alts and New Players
If you are preparing multiple accounts or want a low-cost setup, this is the most efficient loadout:
Minimum Loadout
- Square Pants
- Snow Sponge
- 1 Las Spatula
- 1 Swashbuckler or Potty
- 1 Cursed Jelly or Jellyfish Jam
This setup gives:
- +4 placements
- Strong attack speed buffs
- Enough damage to clear bosses quickly
Testing shows that adding more units often increases clear time due to spawn delays, making a smaller optimized team better.
Why Grinding This Update Is Worth It
This update rewards preparation, not spending. With duplication issues fixed, exclusive Prismatics will hold long-term value. Players who clear bosses early, especially across multiple accounts, will have a major advantage in trading and progression. Even if you only prepare one account, focusing on:
- Pets
- Two strong Prismatics
- Proper traits
is enough to stay competitive.
The free Prismatic in Spongebob Tower Defense is one of the biggest free-to-play opportunities the game has ever offered. Clearing all 16 bosses may not be easy, but with the right setup, it is absolutely achievable without paying anything.
Focus on efficient teams, prioritize pets over extra units, and prepare early. Whether you are playing on one account or several, this update rewards smart grinding and planning far more than raw spending.