This hack enables options menu without code, and adds two new difficulty levels: HARD and EXPERT.
EXPERT difficulty matches well-known pirate carts with deleted copyrights, but Shredder is not immortal
[player takes twice damage from enemies, and player damage vs enemies lowered twice].
HARD difficulty it's a new hybrid level: player damage vs enemies twice lowered, but player takes normal damage.
EASY and NORMAL levels are same as in original.
Teenage Mutant Ninja Turtles III - The Manhattan Project (U) [!].nes
(GoodNes v3.23b)
CRC32: DBB3BC30
MD5: 483695DE094F4DD49652C5BC78BDBA19
SHA-1: 30B6AFB694AB5045B88F723A1ADE44575C33FB69