Jezz Ball (Sometimes worded JezzBall) is a classic arcade-style puzzle game developed by Microsoft for Windows 3.1 as part of the Microsoft Entertainment Pack. Players trap bouncing balls within a rectangular grid by drawing horizontal or vertical lines to section off empty space. The objective is to isolate 75% of the area without letting the balls touch the in-progress lines. Each level introduces more balls, increasing the difficulty. With its simple controls and addictive gameplay, JezzBall became a nostalgic favorite of early Windows users.