Quick Answer
Use the Summer 2026 event guide for the full route, the current event checklist for today’s short list, and this page when the specific question is how to clear Watermelon Defense efficiently.
Watermelon Defense at a Glance
Content type
Multi quest in the Summer 2026 event
Unlock
Summer 2026 event chapter 2, around August 25
Boss
Masked Great-Hammer
Weaknesses
Wind (super), then ice and fire
Main reward
Masked Great-Hammer Memory, multi point track
Published window
Live with the Summer event through about September 22, 2026 11:59 JST
Always confirm
Live stage screen, mission list, and timer
Unlock and Access
Watermelon Defense is part of the SmashGrow Summer 2026 event and opens with the chapter 2 wave around August 25, 2026. It is a multi quest, so you enter through the multi board by hosting or joining a room. If the quest is still locked, clear the current event story chapter first.
Recommended level guidance from published coverage:
| Difficulty | Recommended level |
|---|---|
| Casual (Easy) | Base-class Lv. 30 / advanced-class Lv. 10 |
| Challenge | Base-class Lv. 50 / advanced-class Lv. 30 |
| EX Challenge | Base-class Lv. 55 / advanced-class Lv. 35 or higher |
Treat this as a limited event multi. Plan your runs around the Summer 2026 window and the multi point track rather than letting the quest sit unplayed.
Boss Profile
The Masked Great-Hammer is the guardian boss of the large watermelon. It is weak to wind as a super weakness, with ice and fire as secondary weaknesses. Mid-bosses include enemies such as mermaids and scorpions that share the wind super weakness, so a wind carry stays useful across the room.
| Element | Usefulness |
|---|---|
| Wind | Super weakness; prioritize wind weapons |
| Ice | Secondary weakness; useful if wind options are limited |
| Fire | Secondary weakness |
| Lightning | Useful on some mid-bosses; not the main carry element |
No confirmed advantage for dark. Prioritize wind first, then ice and fire coverage.
Missions and Special Rules
Published mission-style conditions include a low-death clear, keeping the large watermelon above a health threshold, and defeating the boss. The watermelon-rock explosion is the reliable way to stagger the boss and deal bonus damage.
| Condition | What to do |
|---|---|
| Clear without many deaths | Keep the team out of avoidable hits |
| Keep the large watermelon alive | Play defense while also pushing the boss |
| Defeat the boss | Push damage when the room is coordinated |
Check the live reward screen in your client for the exact mission list and reward values before farming.
Recommended Builds
Weapons
Wind weapons are the top recommendation because they hit the super weakness on the boss and most enemies. Sea Storm Staff fits a magic carry, while Falcon Blade is a strong wind physical option. Ice weapons such as the Genmaou weapon and Blue Steel Machine Lance are good secondary picks.
| Weapon | Element | Why it fits |
|---|---|---|
| Sea Storm Staff | Wind | Top wind pick for a magic carry; pulls enemies together |
| Falcon Blade | Wind | Strong wind physical option; movement speed value |
| Genmaou weapon | Ice | Ice coverage and a wide-range skill for the room |
| Blue Steel Machine Lance | Ice | Ice physical option with strong multi-target output |
| Ice Staff | Ice | Safe ranged ice coverage |
Party and Vocation
Published clear advice favors a balanced room. A Sage or magic carry running wind coverage is a strong main slot, with a physical carry and a durable class such as Paladin filling the other roles. Use the multi board to fill whatever role your own lineup is missing.
Adventure Skills
Prioritize ball-type adventure skills such as the Wind Ball (Bagi Ball) line and arrow-type skills such as Hyado Arrow so damage stays efficient across the large room. Keep the skill pool focused so the targeted adventure skill is easier to draw, and grab the arrow scroll when it appears because it greatly improves clear speed.
Strategy Points
1. Use the Multi Board to Fill Roles
This is a multi fight, so the single most reliable step is building a balanced room. Host or join with a clear plan: one wind carry, one durable class, and everyone bringing a build that already clears similar content. A stable room beats an uncoordinated one.
2. Lead with Wind Damage
Wind is the super weakness on the boss and most enemies. Put Sea Storm Staff or Falcon Blade on the main damage slot and let ice or fire cover the secondary role. Keep the fight moving so the party is not punished for standing still.
3. Use Watermelon Rock Explosions
The Watermelon Rock explosions are the reliable way to stagger the Masked Great-Hammer and deal bonus damage. Hit the boss with the explosion while it walks in, and use it to interrupt its swing attacks. Defense against the explosion also matters for survivability.
4. Prioritize Ball- and Arrow-Type Skills
Ball- and arrow-type adventure skills keep damage high across the wide room. Wind Ball hits many enemies at once, and Hyado Arrow clears wide. Do not fill the skill pool with unrelated options that make the targeted skill harder to draw.
5. Play to Defend and Survive
You clear by defeating the boss or by surviving the timer and keeping the large watermelon safe. If the boss has too much HP to kill in time, play strong defense, clear the mid-bosses, and let the timer work for you.
Masked Great-Hammer Memory
Masked Great-Hammer Memory is a limited event Memory obtained from Watermelon Defense. It is a purple Magic-oriented memory with spell damage and plant-family resistance, fitting accounts that want a purple slot during the Summer 2026 window.
| Property | Value |
|---|---|
| Color / slot fit | Check the Memory page for slot details |
| Main effect | Spell damage and plant-family resistance |
| Acquisition | Watermelon Defense clear / multi point reward |
| Event period | Live with the Summer event through about September 22, 2026 11:59 JST |
Check the Memory tier list for current ranking context and the Memory page for exact stats before committing heavy farm time.
Stop Lines
| Stop when | Why |
|---|---|
| Chapter tasks, dailies, or free tickets elsewhere are unfinished | Those are safer limited value |
| Clears are slow or unsafe | Upgrade the team before forcing the missions |
| You already secured the Memory quality you need | Extra repeats have diminishing return |
| The room is uncoordinated and wasting stamina | Re-queue with a clear build instead of forcing runs |
Related Reads
| Page | Use it for |
|---|---|
| SmashGrow Summer 2026 Event | Full event route, Marine Slime, cooking skills, and exchange |
| King Suika Rock Shrine | The chapter 3 shrine unlock, weakness chart, and builds |
| Masked Great-Hammer Memory | Exact stats, keep or skip, and upgrade advice |
| Current Event Checklist | Today’s short action list |
| Sea Storm Staff Weapon Data | Wind staff stats and acquisition |
| Best Weapons Tier List | Weapon priority after the event |
| Best Memories Tier List | Broader Memory priority after the limited drop |
| Co-op Guide | Room codes, matchmaking, and host or join decisions |
FAQ
Do I need Sea Storm Staff to clear Watermelon Defense?
No. Wind weapons such as Falcon Blade can also work when your team is stable, and ice or fire weapons are useful secondary options. Pull only if the weapon fills a missing role on your account.
Is Watermelon Defense harder than the Summer strong enemy?
They are different content types. Marine Slime is a solo strong enemy, while Watermelon Defense is a multi quest that relies on coordination. Choose by what your account still needs and which content your team clears safely.
Where should I confirm the rewards and mission times?
Use the live stage screen and reward screen in your client before repeating the quest. This page keeps the unlock and farm decision clear without listing every unconfirmed reward value.