Spongebob Tower Defense How to Get Free Primsmatic Pet SPU-31 Guide

Getting a free prismatic pet in SpongeBob Tower Defense is not something that happens often, which is why SPU-31 has become one of the most talked-about rewards in the game right now. This prismatic pet is not only free, but also considered the strongest pet ever released so far.

If you want a serious boost in Endless mode and faster progression overall, this is one reward you should not ignore. In this guide, we will explain exactly how to get SPU-31, what makes it so powerful, and why AFK farming is now more important than ever. Also check out our Spongebob Tower Defense Codes for more rewards!

What Is SPU-31 in SpongeBob Tower Defense?

SPU-31 is a prismatic pet introduced through the AFK system rework. Unlike most pets, SPU-31 provides both massive stat boosts and direct damage, making it useful for every stage of the game. SPU-31 main bonuses:

• +2 unit placement
• +50% gold gain
• +32 damage
• +32 range
• -32% cooldown

On top of these buffs, SPU-31 also attacks enemies on its own. This makes it strong enough to carry early and mid-game runs, and still remain relevant in late-game Endless mode.

How to Get Free Prismatic Pet SPU-31

SPU-31 is obtained only through AFK rewards, meaning you do not need to summon, trade, or spend premium currency.

Step 1: Enter AFK Mode

• Go to the AFK portal in the main map
• Talk to Patrick to enter the AFK area
• Stay inside the AFK zone to start earning rewards automatically

You do not need to actively play. As long as your character remains in the AFK area, rewards will continue to generate.

Step 2: Understand AFK Reward Timers

AFK rewards are given based on time spent in the AFK zone. AFK reward intervals:

• Ultra VIP Game Pass: every 8 minutes
• No Game Pass: every 10 minutes

The more time you spend AFK, the more reward rolls you get, which increases your chance of obtaining SPU-31.

Step 3: Keep AFK Farming Consistently

SPU-31 is not guaranteed from a single reward claim. It is part of the AFK reward pool, so consistency is key.

Tips to improve your chances:

• AFK overnight or during long idle sessions
• Use private servers to avoid disconnects
• Make sure auto-sleep or auto-shutdown is disabled on your device

The system rewards patience. Players who AFK longer will naturally have better odds.

Why SPU-31 Is So Overpowered

SPU-31 stands out because it affects almost every important game mechanic at once.

• Extra unit placement allows stronger setups
• Gold bonus speeds up upgrades and scaling
• Cooldown reduction increases overall DPS
• Direct pet damage helps clear waves faster

In Endless mode, SPU-31 alone can push runs much further than normal pets, even without a full meta team.

Can Free-to-Play Players Get SPU-31?

Yes. SPU-31 is completely free-to-play friendly.

• No Robux required
• No trading needed
• No limited-time purchase

While Ultra VIP helps speed things up, it is not mandatory. Free players simply need to AFK longer to reach the same reward chances.

SPU-31 is easily one of the best free rewards SpongeBob Tower Defense has ever offered. With its prismatic rarity, massive stat boosts, and built-in damage, it completely changes how players approach Endless mode and progression. If you want a long-term advantage without spending currency, AFK farming is the answer. Stay consistent, stay patient, and eventually SPU-31 will be yours.