Upon clicking the green flag, hover over the black square in order to gain a point and some additional time back. If you run out of time, the black square will disappear and the game will end. The black square will appear in a RANDOM position, so watch out for that!
This is a game I had made back in 2021 and was sitting in my backlog of offline Scratch projects. The game is called 'File Mouse' because you use your mouse to get the black square and the game's sb3 file size is only 4kb (kilobytes).