The game is afoot in Gainesville with Sherlock Holmes and his trusty friend, Dr. John Watson. “Sherlock Holmes: The Final Adventure” can be seen on stage at 7 p.m. today and 2 p.m. Saturday, Nov. 14, in the Cervantes Theatre at Riverside Military Academy, 2001 Riverside Drive, Gainesville. The free production is based on the original 1899 play by William Gillette and author Sir Arthur Conan Doyle.