Percival, Gwain, Lancelot and Silver
In order to unlock the mid evil characters Percival, Gawain and Lancelot you must clear knight's passage in Adventure Mode. Once this is done you can unlock character Silver. Complete the mission Lancelot Returns in battle mode after unlocking Percival and Gwain to unlock the Character Silver.
Unlockable Characters for Battle Mode
There are many secret characters in Sonic and the Black Knight that can be unlocked for the battle mode. They can be accessed and played once certain criteria have been fulfilled or characters have been beaten in the story mode. The list of how the characters are unlocked in the story mode are as follows:
To unlock Amy Rose: Defeat the final boss.
To unlock Blaze: Defeat Lady Percival.
To unlock King Arthur: Collect all 5 King Arthur's legends story books.
To unlock Knuckles: Defeat Sir Gawain.
To unlock Shadow: Defeat Sir Lancelot.
To unlock Tails: Finish the first Castle Camelot Mission.
To unlock Jet: Get a 5 star ranking on the Great Megralth level.
Super Sonic And Excalabur Unlockables
In order to unlock character Super Sonic, first beat the game. This will unlock the knight's passage level. Beat the knights passage level and return the sacred swords the player will get upon completion. Once the swords have been returned the stage dark hollow will now be available as a stage to select. The characters super Sonic and Excalibur will be available and unlocked.
You can also unlock a bonus song. To unlock the hidden song Seven Rings in Hand, the player must collect all seven world rings hidden in the legacy stages.
Character Profiles and Medals
Character Profiles can be unlocked as a bonus in Sonic and the Black Night for all characters. To obtain the profiles for Sonic Black Knight Sir Galahad and Silver: Complete Knight's Passage in legacy with five stars. To obtain profiles for Sir Gawain and Knuckles complete Titanic Plains and defeat the boss with five stars.
To obtain profiles for Sir Lamorak and Jet complete Dragon's Lair in legacy with five stars. To obtain profiles for Sir Lancelot and Shadow complete Deep Woods and defeat the boss with five stars. To obtain profiles for Sir Percival and Blaze complete the Molten Mine and defeat the boss with five stars.
All collectible metals shows change the music in different levels. The music will change on replay of game to songs or remixes of songs from past sonic games. To change the music in the game perform the following actions The medal of Lancelot will change music to All Hail Shadow by Crush 40. It is earned by beating Lancelot and earning his game piece.
The medal of Gawain will change the music to to Knuckles' theme from Sonic Adventure. Medal is earned by beating Gawain and earning his game piece.
The medal of Percival will change the music to the Blaze battle music from Sonic Rush. Medal is earned by beating Percival and earning his game piece.
The Medal of Sonic will change the music to "What I'm Made of" from Sonic Heroes. Metal is earned by beating the legacy stage on Knights Passage and earning that levels' game piece.