Builder Base Hammer Jam: 50% Off Upgrades & Tips

added blog Games

2026-05-26 02:42:59 -

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...

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