Get lots of lives
If you like playing 1 player, but aren't quite good enough to beat this game alone yet, pick a 2 player game and play all the way to the end of level 1-1, but don't go into 1-2. Beat up all of player 2's lives, then continue as player 2. Keep doing that until all of player 2's...
Battletoads and Double Dragon: The Ultimate Team
DF60-D76D Start with 2 lives
DB60-D76D Start with 10 lives
DE6E-1466 Enemies have less energy
40B8-04AF Infinite lives
DD65-DD0D + CB66-D46D + DF66-D4AD Start on level 2 with 11 lives
DD65-DD0D + CB66-D46D +...