“Best minigame”
The Virtual-On type game in Xenosaga: Episode 1. It’s completely optional, and completely full of options for something so separate from the main game. You don’t have nearly as many mechs to choose from as in the fighting game minigame in Xenogears (which is another one of my favorites), but you can customize their weapons in ways that make this a better reason to collect them all than the battles in the main game are.
On the Edge of Enlightenment 
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