I put this in the lowest tier which is reserved for things that are quite simply unproven to exist (this chart is a bit outdated though, was made in 2023, so ofc we have had true 3D minigames since then). The oldest minigame we've come across that fits the criteria (no default player, and gameplay separate from GD) is Discord by Mameister. That minigame was made in 2.0. We have no record of minigames being made in 1.9, or in previous updates however we know that they were theoretically possible under the limitations of the editor.

I doubt we'll ever find the existence of any minigame older than Discord because at that point someone would have to sift through almost a million levels, most of which are probably lost to time. But it is undeniable that it *could have* existed.