Kingdom.hearts.hd.1.5.and.2.5.remix.network.fix... -

Set the game to Windowed rather than Borderless or Fullscreen. You can then use tools like Borderless Gaming to fill the screen without triggering driver crashes.

For a smoother experience, the community highly recommends the and KH-ReFined mods. Kingdom.Hearts.HD.1.5.and.2.5.ReMIX.Network.Fix...

This is a comprehensive fix that addresses crashes related to window resizing and indefinite hangs during shutdown. It also adds features like auto-saving between worlds and unlocked cutscene frame rates. Set the game to Windowed rather than Borderless

Oddly, some high-end GPU users (like those with a 7900XT) found the game more stable when running on integrated graphics rather than their dedicated cards. This is a comprehensive fix that addresses crashes

A common pain point involves the game failing to launch or hanging during "Network Connection" checks.

If you see a "Failed to create system data" error, it is often caused by Windows Security or Controlled Folder Access blocking the game from writing to your Documents folder. Whitelisting the game's executable in your antivirus settings can solve this. Essential Quality of Life Mods