Wild Gunman (WarioWare, Inc.: Mega Microgame$!)
From the Super Mario Wiki
The objective of the game is to wait for the signal, then fire at the gunman as quickly as possible by pressing . Do it too soon and the player will draw a foul, do it too late and the player will be shot by the gunman. As the speed increases, the gunman will take less time to shoot, giving the player less time to react. The times listed below are how long the gunman takes to shoot when the microgame is on the lowest speed.