In current console gaming jargon, a 1-up refers to an item that gives the player an extra chance to complete the game. Often, 1-ups are obtained by completing in-game challenges such as collecting specific items. For example, if the player collects one hundred coins in Super Mario Bros., a 1-up is awarded. (A variant of this incorporates pickups worth multiple life-giving items.) 1-up items are often hidden in dangerous or hard to reach areas which force the player to put their character in peril or devote extra time to the game to collect them.
Some games feature items that award more than one life at a time. They are usually referred to as 2-ups, 3-ups, 5-ups, etc., and are often represented by different colored 1-up items or text.
A few games may award items in addition to or in place of an extra life if the player earns a 1-up. For instance, in Rise of the Triad, if the player has less than 75% of their maximum health, a 1-up item heals the player to full health instead of granting an extra life, and a 3-up item heals the player and gives 2 extra lives instead of 3. In Wolfenstein 3D, a 1-up item gives the player an extra life, full health, and an extra 25 bullets.