Super Mario Bros. is a platforming game for the Nintendo Entertainment System released in 1985. When Bowser invades the Mushroom Kingdom, it's up to Mario to stop him and save the Princess.

Batman Bros. Co-Op. by NesDraug (version 1.2)

Bruce Wayne has grown old. He is no longer the Batman he used to be but he still needs to rescue Robin since he got captured. So he created a Batclone. An almost identical Batman. A brother, if you like. A Batbro.

- Two player co-op mode
- Players are Batman
- Enemies are altered
- Slightly altered levels
- Changed warps
- All colors are changed
- Mushrooms are now bat masks
- Fire flower is now Batarang
- Mushrooms are batmask with blue eyes
- Stars are now bats
- Coins are bats
- Bat flag
- Backgrounds are altered
- Game over bat symbol
- New title screen
- 50 Coins to get 1UP

Process:
- Sprite editing in NES CHR Editor
- Sprite editing in Tile Layer Pro
- HEX-editing in FCEUX to fix the colors
- The first buggy version was released in December 2018
- SMB Utility to change levels (in original SMB)
- HxD to import the level data into the Two player hack
- The finished version 1.2 was released in August 2019

This hack is based on the Super Mario Bros. - Two Players Hack by Corpse Grinder and Ti

Super Mario Bros. (W) [!].nes (GoodNes V3.23b)
md5: 811B027EAF99C2DEF7B933C5208636DE
sha-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922