“Battletoads (& Double Dragon)- the Dark Queen Rematch” hack has been updated to version 1.3 .
Main change that game can now be completed in 2-players mode without ’synchronized swimming’ : “the revolution” now adapted to 2 players, “intruder excluder”, “ice caverns” and some other levels yet more easier than in version 1.2 . Also fixed many bugs and added energy power-ups for Jimmy and Billy. See ‘ReadMe’ for detailed changelog.

http://www.romhacking.net/hacks/1653/