Unlockable character
An unlockable character is a character that is not available at the start of the game (unlike a starter character), but must be unlocked. A special criteria is needed in order to unlock a character. First, the player must do a special task, once the task is done, then a message will display "Warning! Challenger Approaching!" with a silhoutte of the character. The player must be then challenge and defeat the character to unlock the character. Template:Spoiler
Super Smash Bros.
Characters
| Character | How to Unlock |
| Captain Falcon | Beat the 1-player mode with any character on any difficulty level in less than 20 minutes. |
| Jigglypuff | Beat the 1-player mode wth any character on any difficulty level. |
| Luigi | Beat Target Test with all 8 starting characters in either 1-player mode or in practice. |
| Ness | Beat the 1-player mode with 3 lives, on normal difficulty, with any character, without continuing. |
Super Smash Bros. Melee
Characters
| Character | How to Unlock | VS Matches Required |
| Dr. Mario | Complete Classic or Adventure mode with Mario without using a Continue | 100 |
| Falco Lombardi | Clear 100-Man Melee | 300 |
| Ganondorf | Complete Event Match #29 (Triforce Gathering) | 600 |
| Jigglypuff | Complete Classic or Adventure Mode | 50 |
| Luigi | Complete Stage #1 of Adventure with time ending in a "2" | 800 |
| Marth | Play Classic Mode with all 14 regular characters, or use them in VS. mode | 400 |
| Mewtwo | Play VS. mode for a combined total of 20 hours* | 700 |
| Mr. Game & Watch | Complete Adventure & Classic Mode with all characters, or Clear Target Test with all characters | 1000 |
| Pichu | Complete Event Match #37 (Legendary Pokemon) | 200 |
| Roy | Complete Classic or Adventure mode with Marth | 900 |
| Young Link | Complete Classic Mode with 10 different characters | 500 |
Super Smash Bros. Brawl
Masahiro Sakurai once stated that he feels that it would be appropriate that third-party, or "guest" characters, like Solid Snake or Sonic the Hedgehog, would be unlockable. It is unknown if this has since been changed, as Sonic was playable at E for All.
Also, the Smash Bros. DOJO!! has confirmed that most unlockable characters will be unlockable by "playing through" The Subspace Emissary. The use of the phrase "playing through" possibly suggests that these characters will be unlocked as you progress through the mode, rather than after completing it. This would explain why Sonic was seen in the Subspace Emissary in the "Sonic the Hedgehog Joins the Brawl" video, and it seems likely that the characters will be unlocked either immediately before or after clearing their respective parts.
Footnotes
* Time required to unlock Mewtwo can be split between players (eg. 2 human players requires 10hrs, 3 human players requires 6hrs 40mins, and four players requires 5hrs).
