My one nagging doubt about Hack100’s rules, which refuses to go away, is the “highest roll wins” tie-breaker for Opposed Tasks.
Opposed Tasks arise when a character pits one of their Abilities against a counter Ability of another. For example, Stealth vs Perception. Or melee combat.
At the highest level, the outcome of an Opposed Task is determined by the overall “quality” of the two opposing rolls. A Critical beats an ordinary success, which beats an ordinary failure, which beats a Fumble. However, two opponents will often achieve the same overall result. For example, both might achieve an ordinary success, or both might Fumble. In such instances, a secondary means of determining the outcome is needed.