Actually there is a lot of tolerance for unfair dice (on bouncy surfaces/good rolls). For a D6 with probabilities [0.5, 0.25, 0.125, 0.0625, 0.03125, 0.03125] (extremely biased to one side), the effective entropy is still 75% of a Vegas quality die (1.937 bits vs 2.585 bits). So 99 dice rolls with a...