Unlike simple "stretching," which distorts characters, a true widescreen mod adjusts the game's internal camera to render more of the environment on the left and right. There are two main ways to achieve this:
For those playing on a real Wii via USB Loader GX or WiiFlow, you may need a specific ISO patch. mario party 8 widescreen mod
This patch modifies the game's executable ( main.dol ) to remove the 4:3 sidebars permanently. Unlike simple "stretching