Reaction tester. Give it a try

[Jorja]

See how good your reactions are
http://members.iinet.net.au/~pontipak/redsquare.html

[sAsLEX]

4 attempts about ten seconds normally

[Jorja]

go left then float in the middle--you'll do 15 easy and 18 isnt really too hard

[marty]

26 secs my best. it's not random, so you can learn the movement pattern