Melty Blood is a Japanese dôjin 2D fighting game, developed by Type-Moon and French-Bread (known as Watanabe Seisakujo prior to 2003), and is a spin-off to Type-Moon's visual novel game Tsukihime. It was featured at the international fighting game tournament Tougeki in 2006 and 2007.

Melty Blood Re-ACT is an expansion to the original game, featuring an 'Arcade Mode' whose storyline takes place after the original Melty Blood. The final revision for Melty Blood Re-ACT - Final Tuned adds several features designed to allow the game to be configured to resemble the gameplay of Melty Blood: Act Cadenza.
(Wikipedia)

Melty Blood Re-ACT Unlockables

Giant Attack mode
Successfully complete arcade mode. Then highlight the "Arcade Mode" option at the main menu, hold Shield and select "Confirm". The character selection screen's background will turn blue to confirm correct code entry. Select a character to battle a giant version of Shiki's stepsister for a random number of rounds.

Alternate stage backgrounds
Do not use any continues while playing in arcade mode. You will fight Aozaki Aoko after defeating Shiroi Len . Defeat her to unlock the background that you fought her on in versus and training modes.

Fight as White Len and Aoko
Defeat Aoko with all default characters and complete each of the eight storylines in story mode.

Melty Blood Re-ACT Final Tuned Unlockables

Hidden options
Hold D while entering the options menu to access hidden options that allow changes to the speed, recovery type from attacks, and more.

Fight against G-Akiha
Highlight the "Arcade Mode" option at the menu, then hold D and press A to select it. The character selection screen background will turn blue to confirm correct code entry. The best times that G-Akiha has been defeated will also be posted on a screen.

Fight against Aozaki Aoko
Successfully complete Arcade mode without losing any fights to fight Aozaki Aoko after White Len. Win the match to unlock hidden dialogue during the ending credits and an extra image of the character that defeated her.


Here is a combo video from Melty Blood Re-ACT: