Skool Daze released by Microsphere in 1984 for the ZX Spectrum and Commodore 64 computers was commercially and critically successful, and praised for its original concept. It has since been regarded as one of the pioneers of the sandbox game genre.
The game features the player as a schoolboy named Eric, with the objective of stealing his report card out of the staff room safe by accomplishing various tasks around the school. The computer controls all the other characters in the game, including the headmaster, other teachers and other pupils. Well that's handy then!