
A chess puzzle, sum or typing test every time you unlock
SkillUnlock puts a few seconds of practice between you and your desktop. Unlock your Mac, solve a chess puzzle, a mental math problem or a short typing test, and you're in. Offline, no account. Math is free; other skills are $5.99 once.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.