Basically - small patch which eliminates STA $2001 = 11100000 making picture bright and colorful as it should be.
My guess is that originally dimmed down picture were intended to make kids' eyes less tired from playing and in my opinion - but sadly results made it go to other extreme - dimmed down picture looks boring.
This patch fixes it.
Felix the Cat (U) [!].nes
MD5: 2F037C1DA6A59F56A0F65C6971F8B3BD
CRC32: 5404BAB9