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Congratulations Joshua! 🌈🌈🌈

Thanks all. I appreciate it

Like Jay Kay said, any difference can make it wide. It can be volume (which is just Pan, so not relevent in StereoHead), it can be EQ (which is volume, but just on some frequency bands), or it can be de-sync, which is more probable here.
For me, the wideness is made by delaying the left and right channels slightly, for a few ms.
You can check Haas effect online for more info about the process.

Stereo width can be created in many ways. It's basically (usually) subtle difference in timings between the left and right channel. But different EQ bands for the left and right channel, dynamic resonance suppression, distortion, reverb, phasing applied on the individual channels can also widen the sound. As well as playing the same notes with a slightly different guitar for example. Or a slightly different sound but not too different.

How it's done exactly for the Stereohead game is a question only Soundgym can answer really because there's a lot of different ways to do this. Even something as iZotope imager can basically create this. Though i think the answer is closer to what @Jay Kay described in his comment.

Can you be more specific in your question? Because the question you asked has been answered - are you asking more generally what causes width rather than what causes it specifically in Stereohead?

Width is literally the difference between the left and the right channel - that's it.

If you have a guitar track and you duplicate it and pan them both hard left and right, you have NO width. You have the exact same information in the sides as in the middle - so you've effectively turned up the volume and done nothing to the width. This is why tricks like the haas effect are used - haas is just delaying the duplicated guitar by a super tiny amount of time and this creates width - because the guitar on one side is no longer identical to the guitar on the other.

You can actually hear this exact thing in the delay game at certain levels. If the delay is below maybe 15ms, it doesn't sound delayed at all - it sounds wider or thicker.

BretzL + Aike have explained this as well, idk if my explanation helps or is just more of the same but if you ask what you really wanna know (e.g. how can I add width to mono instruments or why does my mix sound centered when I've panned everything wide) then you'll likely get better info. This is just the objective truth of what width is.

Awesome job!

Congrats Kokoyo! ⭐⭐⭐

Kokoyo, congratulations for winning your Golden Ears! Super!

Congratulations!

Way to go, Mykyta! Congratulations for winning your Golden Ears!

Fantastic work!

Awesome job!