Your own game

Fix different ROM files in a room

A mismatch means your bytes differ from the host's file. Different regions, releases, and patches are common causes.

Joybito team

What to do

Technical references

Solo mode runs a local game without waiting for a friend. No multiplayer room is needed.

Custom multiplayer needs matching local files on both devices. The site does not send your ROM to your friend.

Netplay synchronizes buttons instead of streaming one player's screen. Both consoles need identical game data to produce matching results.

The picker accepts iNES and NES 2.0 files, commonly named .nes. It checks the header, declared data length, size, and initial mapper support.

The picker reads one ROM and does not unpack archives. ZIP packaging is not executable NES game data.

This build includes Table Tennis and an early Super Tilt Bro ROM at 40,976 bytes each. They are only part of the initial page transfer.