Unlockable

Unlockable refers to any element of the Super Smash Bros. games that is not available from the start, but must be earned by completing some task. A task often requires the player to complete a game mode with a particular character or difficulty level.

Unlockable Characters
A unique criteria must be met in order to unlock a certain character. Typically, the player must accomplish a particular in-game feat. Once complete, a message will display: "Warning! Challenger Approaching!" or "Challenger Approaching! A new foe has appeared!" with a silhouette of the character the player is about to face. The unlockable character will then be fought by the last character Player 1 had used. By winning the challenge and defeating the opponent, the character becomes playable and the notice will appear informing them it's been unlocked and logged into the notices.