Spongebob Tower Defense Update 20 Guide, New Unit, Codes & More!

The latest update for Spongebob Tower Defense in Roblox brings a major shakeup with a brand-new unit rarity, a powerful new unit, and some handy quality of life improvements. Whether you’re a veteran player or just coming back, this guide covers everything you need to know about Update 20, including the new Exotic Mega Hydra Karen unit, how to get it, codes, and new gameplay features.

What’s New in Spongebob Tower Defense Update 20?

Introducing the Exotic Rarity and Mega Hydra Karen

The biggest highlight of Update 20 is the arrival of the Exotic unit rarity. This rarity sits above the previous tiers and comes with unique features. The first Exotic unit released is Mega Hydra Karen, a splash damage powerhouse with a devastating special ability.

• Exotic Units come with a minting system showing the total number of that unit in existence and your unique unit number, adding collectible value.
• The unit comes in different variants: Normal, Shiny, Wombo, and Shiny Wombo, each with increasing damage, range, and faster cooldowns.
• The Mega Hydra Karen fires a powerful green laser that deals splash damage and has an ability that unleashes triple beams covering a massive splash radius.
• At max level, Mega Hydra Karen boasts 95,000 damage, a 1.1-second cooldown, and 60 range.

Also check out how Mega Hydra is in our Spongebob Tower Defense Tier List!

Unit Ability Breakdown

• The ability takes 90 seconds to recharge at normal speed but scales down with faster game speeds (17 seconds at 5x speed).
• When activated, it fires three colored beams that deal huge area damage, wiping out clusters of enemies instantly.
• The splash radius from the ability is so large it can hit multiple enemies simultaneously, making it extremely effective in tight waves.

How to Get the Exotic Mega Hydra Karen

There are two ways to obtain this new unit:

1. Playtime Rewards There is a rare chance (1 in 20,000 normally, improved by x20 luck weekends) to get this unit for free during gameplay. This method is available only until Monday at midnight (after which the event ends).
2. Crate Purchases Exotic units can be purchased via crates in the shop. You can buy one, three, or five crates at a time, with discounts for bulk purchases. These crates are bought with Robux and contain chances to get various Exotic unit variants.

Update 20 Quality of Life Improvements

• New Attack Priorities: You can now set your units to target bosses, strongest, fastest enemies, and more, improving your tactical control during battles.
• Claim All Quests Button: Quickly collect rewards from all completed quests without clicking each one.
• Team Replacement: Equip a unit loadout and instantly save it as a team setup without manual assignment.
• Infusion Max Select: You can now fuse your units in bulk with a “Select Max” button, saving time and clicks.
• Swap Units Easily: When your loadout is full, equipping a new unit prompts you to select which current unit to replace directly.

How to Use Mega Hydra Karen Effectively

• Use the special ability strategically during high enemy waves to maximize its splash damage.
• Take advantage of the cooldown reduction at higher game speeds.
• Combine with traits and other units like Seabear and Secret Formula to boost damage output.
• Prioritize bosses or the strongest enemies with new attack priority settings to optimize defense.

Spongebob Tower Defense Update 20 Codes

• GIVEMEDRAGONCAPSULES

Also check out our previous Spongebob Tower Defense codes for more redeemable rewards!

Update 20 in Spongebob Tower Defense adds a fresh new layer of strategy and excitement. The Exotic rarity and Mega Hydra Karen unit introduce collectible value alongside powerful gameplay advantages. Quality of life changes make managing your units easier and more intuitive, while limited-time events provide chances to score rare rewards.

Whether you decide to grind for the free playtime reward or invest in crates, this update offers plenty of ways to enhance your defense lineup and push further than ever before. Keep an eye on limited-time codes and events, and experiment with the new attack priorities and unit fusions to optimize your play style.