X account Bo (Low Context Burning Rangers) posted earlier that the 2000 PlayStation game Crash Bash has hidden 16:9 widescreen mode. In order to active it you need to input the following on the menu screen:
Right, Left, Left, Right, Left, Left, Right, Left, Left, Right, Left, Left, Left, Right, Left
Keep in mind that you need to be quick and have to execute the commands within two seconds. So it may take some practice. In the X post Bo confirms it working on the NTSC-U version, but others confirm in replies that it works on the PAL version too.
Are you gonna try this? Is so let us know how you get on.