One of the available upgrades in Batman: Arkham Asylum is the "Critical Combo Strikes":
Critical Combo Strikes Doubles the power of combo hits and perfectly timed attacks will count as 2 combo hits.
After unlocking it I do occasionally get a "critical!" message, but I'm not really sure what triggers them. What is a perfectly-timed attack, and how can I execute one?
Best Answer
To get the criticals you need to time the button press for your next attack just as the current attack lands. There's a small window around the time so it can be slightly after or before, but not a lot.
Spend some time in the first Challenge room... When you're doing it right, it has a very fluid feel to it. Once you get the rhythm down it's almost hard not to get the criticals.