Game Development Dictionary
2) A monster level:
The relative strength and skill of monsters and NPCs may also be indicated by level. For example, a 1st level monster is very weak. But a 23rd level monster is a much more formidable opponent.
3) A difficulty level: In some games, the player is able to control how easy or difficult it will be to play the game. For instance, playing the game on the "easy" or "please don't hurt me" setting makes the game easier, while playing the "difficult" or "I'm completely insane" version will be much different.
4) A game level: A section of the game. Most modern games require the computer to process a tremendous amount of information. These data cannot all be stored in the computer's main memory at the same time. (Sound files in particular take up a lot of space.) So the game is broken up into sections, or levels.
When a game level is to be played, the computer loads only the information which is required for that section of the game. When that portion of the game is finished, the computer loads the information for the next game level. (Because this usually means that the player must wait before continuing to play the game, some developers have chosen to implement "streaming", in which portions of the game are alwaysbeing loaded.)
5) To gain a character level: Some allow the player's character to increase in level. When the character attains the next level, the character is said to have "leveled up". It is not uncommon for players to refuse to stop playing an RPG until a character has reached the next level.