Using small, dense objects like bouncy balls in a toy crane machine is possible but often challenging. These machines are typically designed for lightweight, plush toys or items with easy-to-grip surfaces. Bouncy balls, being smooth and heavy for their size, can easily slip from the claw's grasp due to poor friction and their tendency to roll away. However, some machines may be calibrated for such prizes, especially if they are shallowly piled or mixed with other items. To improve success, look for machines with stronger claws, shallow prize depths, or balls wedged against corners. Always observe the machine's behavior first—if claws consistently drop bouncy balls, it might be better to try for different prizes. Ultimately, while bouncy balls can be used, they require strategic play and patience to win.