Neo Contra (PlayStation 2)
CheatingDome.com
19 Lives
Enter this at the title screen: UP, UP, DOWN, DOWN, L1, R1, L2, R2, L3, R3.
Best Ending
Complete stage 7.
Bill II
Clear stage 7 w/ Rank S.
Ending (Easy)
Finish Stage 5 on Easy Mode.
Ending 1 (Normal)
Finish Stage 5 with a "B" or higher Total Rank.
Ending 2 (Normal)
Finish Stage 6 with an "A" or higher Total Rank.
Ending 3 (Normal)
Finish Stage 7 (if you finish with an "S Rank", you'll get an additional congratulatory message).
Extra Stages
Clear first five stages w/ Rank A or better.
Gallery
Beat the game twice.
Jaguar II
Clear stage 7 w/ Rank S.
Katana Jaguar
Just play any stages on normal difficulty.
Lucia
Clear game in 20 minutes or less on any difficulty.
Lucia II
Complete the game with Lucia and obtain rankings of 100% for every level.
The Music Box
Beat the game once.
Theater
Complete the game with A rank.
Weapon Set D
Beat the game once.
Weapon Set E
Clear first five stages w/ Rank A or better.
Weapon Set F
Clear first five stages w/ Rank A or better.