How the leaderboard works
Scores are submitted by players from the result screen of each test. Nothing is submitted automatically — you choose a nickname and press submit, and only that nickname and the score are stored. Each board has three views — today, this week and all time — and each lists up to the top 100 entries, so a strong run stays visible instead of being pushed off by newer ones.
Reaction-based boards rank lowest first, because a smaller number of milliseconds is better. Memory and IQ boards rank highest first. The two are never mixed in one table.