The odds of failure are pretty low in most circumstances, but maybe that's appropriate for bright superhero game.
- 1d - 33% success, 0% extra
- 2d - 56% success, 3% extra
- 3d - 70% success, 7% extra
- 4d - 80% success, 13% extra (max without pull nor advantage)
- 5d - 86% success, 20% extra
- 6d - 91% success, 26% extra
- 7d - 94% success, 33% extra (max with pull or advantage)
- 8d - 96% success, 40% extra
- 9d - 97% success, 46% extra
- 10d - 98% success, 52% extra (max with pull and advantage)