One life, no timer
Accuracy Attack removes the clock entirely and gives you a single life. The first incorrect entry ends the run, so your score is simply a count of how many values you got through without a mistake. There is no time bonus and no penalty for thinking.
How to play it well
Deliberately slow down. The optimal pace in this game is noticeably below your comfortable speed elsewhere, because a single slip wipes out the run regardless of how quickly you reached it.
Verify before you press Enter. Building the habit of a half-second check on the entry field — not the target — is the whole point of the exercise, and it is the habit that separates operators who can be trusted with financial data from those who cannot.
If you want a number to beat, run the same difficulty three times and take your best streak as your baseline. Your high score is saved per difficulty level.