Quad64

About

Super Mario 64 is Nintendo's 1996 3D platformer for the Nintendo 64, in which Mario explores a hub castle and collects Power Stars hidden across themed worlds to rescue Princess Peach from Bowser. Quad64 is an open-source Super Mario 64 level editor built in C# with Windows Forms and OpenTK, modeled after Toad's Tool 64 but with broader ROM compatibility — it can load and save both extended and vanilla 8MB ROMs, all four major regional versions, and multiple byte-order formats, with support for most N64 texture formats. Development has stopped as of this beta build, and the author now recommends SM64 ROM Manager as an actively maintained alternative.

Getting started

Quad64 requires the OpenTK and JSON.NET libraries and loads directly from a user-supplied SM64 ROM file. Note that macro and special objects can't be edited on a vanilla 8MB ROM without first using a separate ROM-extension tool to expand it.

Known issues & limitations

• compatibility: Macro & Special objects are not editable with vanilla 8MB ROMs due to MIO0 compression.

Additional notes

Alternative

The author recommends Pilzinsel64's SM64 ROM Manager as an actively maintained alternative, since this project is no longer being worked on.