Updated: April 12, 2026

SpongeBob Tower Defense Update 13.5 — Easter Sunday 2026

By Earnaldo Team • April 12, 2026 • 9 min read

SpongeBob Tower Defense dropped Update 13.5 Easter Sunday in the April 5–12, 2026 window, bringing the game's first Easter-themed Prismatic-tier unit in the form of Kuddly Basket, an egg-adorned variant of the beloved Kuddly Krab. The update also launched a limited Easter Event with a Golden Eggs currency system, a dedicated event shop, and two new redeemable codes — OPPRISMATIC and MASSIVEEASTER — that went live on April 6 and April 8 respectively. If you haven't claimed those codes yet, jump in now before they expire.

Kuddly Basket — The New Prismatic Unit

The headline addition in Update 13.5 is Kuddly Basket, a Prismatic-tier reskin of the existing Kuddly Krab unit. Where Kuddly Krab is the fan-favourite support unit known for its healing and buff mechanics, Kuddly Basket wraps the same core kit in a fully Easter-themed costume — think pastel colours, egg motifs, and seasonal flair appropriate to the holiday window.

Kuddly Basket comes with multiple variants, each offering distinct visual palettes and minor cosmetic differences. The variants follow the Easter egg colour scheme that WonderWorks used across the entire event's aesthetic: earthy pastels, golden highlights, and the characteristic Prismatic shine that makes the unit stand out in any active loadout. The variant you receive depends on how you obtain the unit, whether through the event's Exclusive Prismatic Unit reward path or through other in-game unlocking methods.

If you already own Kuddly Krab, Kuddly Basket is not a direct upgrade to your existing copy — it is a separate unit entry with its own slot. Both can be placed in loadouts simultaneously. For competitive play, the Prismatic version's unit sign provides a prestige marker but does not alter base stats, so the performance gap between the two versions comes down to personal preference rather than raw power.

What Prismatic Tier Means in SpongeBob Tower Defense

Prismatic is the highest rarity tier currently in SpongeBob Tower Defense. It sits above Exotic in the rarity hierarchy, which itself sits above Legendary. Understanding what actually separates Prismatic from Exotic is important before you decide how much effort to invest in chasing Kuddly Basket.

The key distinction is the unit sign. Every Prismatic unit displays a permanent sign above it during placement that shows the username of the player who obtained it. This is purely cosmetic — it does not change damage output, range, or any numeric stat. What it does is signal to everyone in your server that you hold a unit from a limited-time event, which carries real social and trade prestige in the SpongeBob TD community.

From a pure meta standpoint, Prismatic units are competitive with the best Exotic units. If you are farming the event primarily for a performance edge, the difference is marginal. If you care about collection completeness, prestige, or future trade value, Prismatic units consistently hold higher value post-event simply because their supply is capped by the event window.

Easter Event 2026 — Golden Eggs & Event Shop

Update 13.5 launched alongside the Easter Event 2026, a time-limited event that runs through the April 5–12, 2026 window. The event introduces Golden Eggs as a dedicated seasonal currency, separate from the game's standard gems and gold economy. You earn Golden Eggs by completing core game modes during the event period.

How to Earn Golden Eggs

Golden Eggs drop from three primary sources across the event:

• Story missions — Completing story stages during the event awards Golden Eggs. Higher-difficulty stages award more eggs per clear.
• Challenges — Daily and weekly Challenge modes drop Golden Eggs on completion. Rotating challenge types mean fresh content across the event window.
• Raids — Raid completions are the highest single-session source of Golden Eggs. Coordinated team play makes a significant difference in raid efficiency and egg yield.

Golden Eggs do not carry over after the event ends. Any unspent Golden Eggs disappear when the Easter Event 2026 closes, so plan your farming and spending before the April 12 deadline.

Event Shop — Egg Basket & Exclusive Rewards

The event shop accepts Golden Eggs in exchange for Easter-exclusive items. The confirmed headline reward is the Egg Basket, which serves as the primary vehicle for obtaining Kuddly Basket and other event-exclusive items. Additional shop items round out the offering with cosmetics and accessories themed to the Easter event.

The developers at WonderWorks also ran a separate Exclusive Prismatic Unit promotion tied to the Easter period, visible on the official Roblox events page. This route provided an additional path to obtaining the Kuddly Basket Prismatic unit outside of the standard Golden Eggs shop, widening access during the holiday window.

New Codes — OPPRISMATIC & MASSIVEEASTER

Two new codes dropped with and shortly after the Easter Sunday update, both still active as of April 12. These are among the most straightforward free rewards you can claim right now — each delivers chests and gems that feed directly into your ability to pull units and progress faster during the event window.

OPPRISMATIC dropped on April 6 and references the Prismatic unit theme of Update 13.5 directly. MASSIVEEASTER followed on April 8, leaning into the Easter holiday branding. Both codes have remained active through the event window, but SpongeBob Tower Defense codes are notorious for expiring without warning — sometimes within hours of release. If you haven't redeemed these yet, do it immediately.

For the full list of working and expired codes, including older codes that may still be claimable, visit our dedicated SpongeBob Tower Defense codes page — it's updated as new codes drop.

How to Redeem Codes in SpongeBob Tower Defense

If you're new to the game or haven't used codes before, there's one prerequisite: you must reach level 10 before the code redemption option becomes available. Once you're there, the process is straightforward.

1. Launch SpongeBob Tower Defense on Roblox (PlaceId: 123662243100680)
2. From the starting screen, tap the Shop button on the left-side menu
3. Scroll to the bottom of the Shop panel and find the code entry text box
4. Type the code exactly as written — codes are case-sensitive
5. Press Redeem and your reward will be added to your account immediately

Some sources list the entry point as a dedicated Codes button rather than through the Shop panel — the interface has shifted slightly across updates. Either way, look for the input field on the left side of the main screen and you'll find it. Chests awarded by codes go directly into your inventory and can be opened straight away for gems, magic conches, or trait rerolls depending on chest type.

Best Strategy for the Easter Event Window

With the event closing on April 12, here's how to approach the remaining time depending on your goal.

If You Want Kuddly Basket

Focus all available play time on Raids for maximum Golden Egg generation, then spend directly on the Egg Basket in the event shop. Redeem both active codes immediately for the free gems, which can supplement any unit pulls you need to strengthen your raid team before farming. Don't get sidetracked by Story grinding unless you've already cleared all Raids for the day — the egg yield difference is substantial.

If You Want to Maximise Free Rewards

Prioritise in this order: redeem both codes, complete all available daily Challenges for their Golden Egg drops, then run as many Raids as your team can support. If you're solo, Story missions are your fallback. The event shop cosmetics are a nice bonus, but if Kuddly Basket is the target, hold your Golden Eggs for the Egg Basket rather than spreading them across smaller items.

If You're a Returning Player

Catch up on Story stages first — they award Golden Eggs and also progress your permanent account level if you're below 10. Getting to level 10 is a prerequisite for codes, so any returning player who hasn't hit that threshold should treat Story as the first session priority. Once codes are unlocked, claim OPPRISMATIC and MASSIVEEASTER before doing anything else.

Update 13.5 in Context — The 13.x Patch Series

Update 13.5 follows the pattern WonderWorks established with earlier seasonal updates in the 13.x series: a mid-version patch that introduces one major Prismatic unit tied to a real-world holiday, a dedicated event currency loop, and a pair of promotional codes to drive community engagement. The Easter Sunday timing — falling in the April 5–12 window — gives players a full week to participate, which is a slightly shorter window than some previous events but long enough to complete the event shop if you play consistently.

The decision to base the new Prismatic unit on Kuddly Krab is notable. Kuddly Krab is one of the most recognised units in the game, with a long-standing community following. Turning it into a Prismatic reskin for Easter gives existing Kuddly Krab fans a direct incentive to engage with the event, while the unit sign mechanic adds a personalisation layer that purely cosmetic recolours don't provide. It's a smart design choice that rewards loyal players who put in the effort during the holiday window.

For comparison, the Exclusive Prismatic Unit event running alongside Update 13.5 on the official Roblox events page shows that WonderWorks is increasingly using the Roblox Events platform to promote these limited-tier units, suggesting Prismatic drops tied to real-world holidays may become a recurring feature of the update cadence going forward.

Getting Started & Useful Resources

If you're new to the game or want a broader overview of how SpongeBob Tower Defense works, the SpongeBob Tower Defense hub page covers unit tier lists, beginner guides, game modes, and everything else you need to get grounded. For a continuously updated list of all working codes, check the SpongeBob Tower Defense codes page — new codes are added as soon as they are confirmed active.

If you're looking for Robux to spend on event items or future Prismatic unit pulls, our SpongeBob Tower Defense free Robux guide covers legitimate earning methods that don't require spending real money. Building a Robux buffer before the next major seasonal event means you won't be scrambling when a Prismatic unit worth chasing drops.

Frequently Asked Questions