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CT-CODE (or CT-Code; an abbreviation of Custom Track Code) is an extension of Mario Kart Wii. It was developed by MrBean35000vr and Chadderz for CTGP Revolution. The name CT-CODE was created by Wiimm, when he implemented CT-CODE support in his SZS Tools.

The main purpose is to allow more than 32 tracks into one distribution. Due to network protocol limits (1 byte for the track selection), the total number of slots is 256. Subtracting a few special slots and the 32 original tracks, there is space for 221 custom tracks. It is recommended to use a multiple of eight custom tracks because of the cup layout, where it has two cups in each column and four tracks in each cup. Most custom track distributions with CT-CODE support have 216 custom tracks along with the 32 original tracks (248 racing tracks total).

Wiimms SZS Tools

The tool wctct of Wiimms SZS Tools uses slots 0x00–0x1f, 0x2a–0x35, 0x3b–0x41, and 0x44–0xfe by default to distribute the custom tracks over the slot system. Option --allow-slots=keywords can modify the default setting:

Enable 32 slots 0x00–0x1f for custom tracks and overwrite original custom track slots. This is the default.
Enable 10 slots 0x20–0x29 for custom tracks and overwrite original battle arena slots.
Enable 5 slots 0x36–0x3a for custom tracks and overwrite the special slots.
CTCODE is available since v2.00 of the tools and is an abbreviation for TRACKS,ARENAS,SPECIAL. It enables all custom track slots mentions above.

The keywords can be combined as comma-separated list. The most common usage is: --allow-slots CTCODE since v2.00, or --allow-slots ARENAS,SPECIAL before v2.00.