Clawing for More
From the Super Mario Wiki
The objective is to use the Ultra Hand to grab the ball and pull it back. To extend the Ultra Hand, use the stylus to move the handle downward, and upward to retract. When the ball is taken to the bottom screen, it disappears and various sprites from NES games appear. These sprites include depictions of Fighter Flies from Mario Bros., Red Koopa Paratroopas, Lakitus and Bullet Bills from Super Mario Bros., Cheep-Cheeps from Super Mario Bros. 3 or ducks from Duck Hunt.
Changes in WarioWare Gold
In WarioWare Gold, the microgame is different, in that there is no ball to grab. Instead, it relies on the Ultra Hand's usage to grab fish, and when this is done, the player must retract the Ultra Hand and drag the fish to one of the three hungry cats, who disappear after the fish has been given to them. However, guarding the fish is the man from the box art for the Ultra Hand. As such, the player must grab the fish from the man's pocket while his back is turned so that he doesn't notice the Ultra Hand, as being spotted with the Ultra Hand not extracted results in a loss. When he begins to turn around due to sound (and not glance at his watch), the player must retract the Ultra Hand immediately so that he doesn't spot the Ultra Hand, as the player will lose if this happens. If the Ultra Hand is successfully retracted before the man turns around, he will glance for a brief moment, look suspicious, and then turn back around. Another threat the player has to deal with is crabs who go for the Ultra Hand in an attempt to knock it away, resulting in an automatic loss should the crabs reach it and knock it away. The player must tap the crabs to make them go back. Later levels involve dogs going after a soccer ball, and the player must retract the hand until the dogs go by. When the player gives the fish to all three cats, the player wins the microgame.