Most machines have a NUDGE which is offered on some games after the reels have stopped spinning or sometimes as part of another feature. Nudge is very simple and frequently results in you achieving a win.

Nudge allows you to step any one or more of the reels by one or more positions, depending on many nudges are offered (usually 1-5). The machine will tell you that Nudge is available by indicating the number of Nudges on a display, flashing the Nudge button and a distinctive sound. Frequently the hold buttons are also used for Nudge.