Somewhere around Bethesda are 25 black cards that say “Max Was Here.” If you find one, the Max Brenner chocolate bar coming to Bethesda Row will reward you with a special gift.

It’s part of the chocolate chain’s promotional push leading up to its June 22 opening on Bethesda Row at 7263 Woodmont Ave.

The Bethesda location won’t provide the full brunch and dinner menus its other U.S. restaurants do, but it will offer hot chocolate, chocolate pizza, crepes, waffles, other items and a retail section with different chocolate products.

Max Brenner staffers hid the 25 cards in different locations around town “in places where ‘Max’ would go,” according to a company spokesperson.

Those who find one can tweet the location where they found the card with #mmmchocolate for a gift.

Photo via Max Brenner