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From January 15 to June 30, 1989, a special Solve-It-Yourself Mystery Sweepstakes was held in conjunction with the Encyclopedia Brown books and Bantam Books. In the back of specially marked copies of Encyclopedia Brown and the Case of the Treasure Hunt, Sobol presented an unsolved mystery for the contestant to solve and submit an answer for a chance to win a prize. The mystery for the contest was called "The Case of the Missing Birthday Gift", wherein Encyclopedia had to solve the case of a stolen bicycle that was given as a birthday gift to Willie Grant on his tenth birthday. The Tigers make an appearance as the suspects in the case; Bugs Meany, Jack Beck, and Rocky Graham all show up at the Tigers' clubhouse.[citation needed]