This is a quick reaction game which is easy to make.
You will need:
paper
pencil
ruler
2 people

Step 1: Getting You're Paper

Okay take a regular piece of paper and cut it so you have the red part.

Step 2: Mark It!

Okay this is the hardest part but easy. Okay with a ruler we will mark the spots.
look at the pic. (sorry my camera wont work and i need 2 use paint)
mark 22 lines about the same length away from each other also next to the 0 make a thumb that fits your thumb size. mark each one as the one that it is like it will be
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
up to 22
okay u r almost done
make sure that when you mark it it has a 0 like in 0.01 its not 1 tenth of a second its 1 hundreh of a sec

Step 3: How to Play

this is how to play
put your thumb on where you drew a thumb
dont touch the paper have your index finger and thumb surrounding it (see picture)
have somone else holding the top of the paper
they drop the paper without telling you
close with your hand as soon as u can
you see where your fingers are that is your time so if it was on .19 then you got it in 19 tenths of a sec.(190 millseconds)
please tell me if u need help!