Enter dice expression in format: XdY where X is number of dice and Y is number of sides. Multiple dice can be added with + operator. Large exact rolls such as 70d6 are supported through exact probability convolution rather than raw outcome explosion.
Sum means: evaluate the expression once and add all dice normally.
Monte Carlo is capped at 200,000 simulations to avoid freezing weaker devices. Exact mode is recommended when you need deterministic results.