I was hired to teach maths, physics and computer science, and ended up building the tooling — including these. They are the practice apps I actually used in lessons, from a five-year-old meeting a mouse for the first time up to older students learning where a file actually lives. They open and run; try them.
Eleven small games teaching one input each: left click, right click, drag, scroll, the spacebar, typing, and the arrow keys. A child who cannot read yet can still finish a round, because every instruction is an emoji and a key cap.
A simulated file explorer with graded exercises: make folders, sort files into them, navigate a path, and learn the difference between cut and copy by having to undo the consequences. Ends with a score the student downloads as a text file — which is itself the last lesson.