Builder Base Hammer Jam: 50% Off Upgrades & Tips : Galevant Institute

Supercell is finally giving Builder Base some love. The Builder Base Hammer Jam event runs from May 17 to May 31, 2026, and it’s a full two weeks of 50% off upgrade costs and times — including the Star Laboratory. You also get a 4x star bonus, extra event tasks, and free Clock Tower Potions and Star Jars. If you’ve been ignoring your Builder Base, now’s the time to jump back in.

Why This Event Matters

Let’s be honest: most players only grind Builder Base for the 6th builder (B.O.B). That extra builder changes everything in the Home Village. This event makes hero upgrades — normally a painful lock — way cheaper and faster, so you can check off B.O.B requirements with less hassle.

Rush to Builder Hall 9

If you’re below Builder Hall 9, rushing is the optimal play. Higher Builder Halls unlock more upgrades, better troops, and the 6th builder — all of which give you long-term value. There’s no point sitting at a low level maxing walls while the real prize waits at the top.

Upgrade Priorities

During the event, focus on upgrades that pay off long-term:

Hero upgrades
Army Camps
Star Laboratory
Key defenses (like Mega Tesla, Roaster)
Anything needed for B.O.B control

Skip traps, decorations, and low-impact upgrades like crushers. Those can wait.

Clock Tower Timing Trick

Most players pop Clock Tower Potions randomly during the day. That’s a mistake. Use them right before you log off or go to sleep. That way upgrades finish while you’re away, and you can start another queue without wasting boost time. Also, if you only have one builder, unlock the second builder before spamming boosts.

Best Troop for Farming

Baby Dragons are your safest bet. They’re easy to use, strong for farming and pushing, and work well for lazy attacks. If you’re unsure what to upgrade in the Star Lab, start with Baby Dragons.

Phase 1 Defense Strategy

Stack your strongest defenses in Phase 1 of your base layout. Attackers get more troops in Phase 2, so making Phase 1 harder to crack gives you better defense results. Don’t split your firepower evenly between both phases.

Save Your Resources

Don’t waste gems or raid medals on Builder Base during the event unless absolutely necessary. Ores still matter more for most players. A simple tip: don’t collect your star bonus the day before the event starts. It stacks for one extra day, so you can begin with two star bonuses ready. Use Star Jars when you’re busy IRL and save Runes for expensive upgrades.

Your Daily Routine

Keep both builders busy, do your star bonus attacks, use Clock Tower strategically, and upgrade heroes whenever possible. That’s really all you need to make huge progress over two weeks. For once, Builder Base grinding actually feels rewarding — so take full advantage while it lasts.

Clash of Clans Gems: What are They and How to Get

Clash of Clans Gems is a valuable premium currency that lets you speed up building times, purchase extra gold or elixir, and unlock exclusive hero skins and decorations. While you can earn some gems through in-game achievements and events, purchasing them remains the fastest way. Instead of only relying on the game’s built-in store, you can visit reputable game trading platforms such as Midasbuy, Codashop, and UniPin to top up Clash of Clans Gems securely and often at better value. These platforms offer multiple payment methods and instant delivery to your account.

Why LootBar is the Best Place to Top Up Clash of Clans

For players seeking a reliable way to perform a Clash of Clans top up, the lootbar game trading platform emerges as an exceptional choice, offering a blend of affordability, speed, and security that elevates the gem-purchasing experience.
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