One (UK) (1986) - Amstrad CPC - Puzzle, Logic

In ONE you are little Valentin, a very well-behaved child who will soon forget his good upbringing. Indeed Alfred Martini came to babysit him. Valentin can't stand Alfred! So he imagines the meanest tricks to bully Alfred. The goal of the game is to annoy Alfred as much as possible! Beat him up, throw stones at him, and let him slip on banana peels. The game takes place in over 30 rooms. You can explore them, pick up objects (to use for new pranks) or simply throw stones and buckets of water at Alfred. But beware! if Alfred catches you then you're done.