The slider is the game: what you are actually setting
Dice has fewer moving parts than anything else on the site, and that is its virtue. There is a slider, a target number, a roll-over or roll-under toggle, a bet field, and a roll button. That is everything. Drag the slider and three numbers move together in lockstep: your target, your win chance, and your payout multiplier. Nothing else on the screen changes, and nothing else needs to. Once you understand that those three numbers are a single quantity being displayed three ways, you have understood the dice casino game completely.
Take a minute to just drag the slider without betting. Push it one way and watch the win chance climb toward the high nineties while the multiplier sinks toward a hair above 1.00×. Push it the other way and watch the chance collapse toward almost nothing while the multiplier balloons. Every position on that bar is a legitimate way to play. Where you leave it is the only real decision in the game, and it is worth making it on purpose rather than leaving it wherever the default put it.