11th Annual

It’s back and bigger than ever. The Tech Topple 2026 returns to The Tech Interactive for its 11th anniversary. Check back for more info on this year's theme!

From July 12-18, the Reactica crew of 15 expert domino and machine builders, will spend a full week building, tinkering, and puzzling their way to the biggest domino topple California has ever seen!

The Big Topple: July 18 at 1 p.m. sharp

One push. Total chaos. Extreme satisfaction. Be there or be square.

Watch the Build Progress All Week Long!

The crew of domino masters will spend a full week constructing an intricate series of puzzles using 50,000 dominos and 250 machines that will solve themselves when toppled. Drop by anytime during museum hours between July 12-18 to see their construction in process, talk to the builders, and watch the magic unfold.

Don’t Miss The Big Topple!

Be sure to join us at The Tech Interactive on Saturday, July 18 for the ultimate destruction. You’ll want to see the action in person to see if the build team can make chain reaction history. The topple starts at 1 p.m.; seating is first-come, first-served; and the experience is included with admission!