Several hacks by Kencho:

• The Dragon Power Meter now increases 33% faster.
• Billy and Jimmy’s basic attacks (just pressing punch or kick) are now two frames faster for better responsiveness.
• Blocking is no longer timed. It is done just by holding the blocking button, in the fashion of other games like Mortal Kombat or Soul Calibur.
• If the defense button is held when another move is finished, will start blocking immediately. The blocking condition is not the button press, but the button hold.
• Blocking while holding a weapon will now drop it and enter the “defensive” mode.
• The R button is now used for blocking, instead of increasing the Dragon Power Meter.

• Summary:
• No-Intro Name: Return of Double Dragon (Japan)
• (No-Intro version 20130701-030720)
• ROM/File SHA-1: 5F03E04CE7BCA88F8C2C11934056A3A67BFB319B
• Patched ROM/File SHA-1: 9F58AB38FF5D3A7C2C256B7614CDC940C5D8E680
• Original ROM information:
• Platform Super NES
• ROM format SNES rom image
• External Header No
• File Size 1048576 (100000)
• ROM Size 1048576 (100000)
• ROM CRC32 10470B58
• ROM SHA-1 5F03E04CE7BCA88F8C2C11934056A3A67BFB319B
• No-Intro entry Return of Double Dragon (Japan)
• Checksum valid Yes
• File MD5 EF37E657E2BB1FBFF7C1C09A184028B5
• File SHA-1 5F03E04CE7BCA88F8C2C11934056A3A67BFB319B
• File CRC32 10470B58
• ROM MD5 EF37E657E2BB1FBFF7C1C09A184028B5
• ROM SHA-1 5F03E04CE7BCA88F8C2C11934056A3A67BFB319B
• ROM CRC32 10470B58