a trick

cheat sheet below:

courtesy of John

The trick:

there are 25 different numbers on the chart

there are 5 numbers of each color.

There are 5 different colors

1,2,3,4,5 = red

6,7,8,9,10 = orange

11,12,13,14,15 = yellow

16,17,18,19,20 = green

21,22,23,24,25 = blue

Once you pick a color, there are only 5 numbers it could be.

They then put one number of each color into 5 different houses.

For example, the first house contains number = 1 (red), 6 (orange), 11 (yellow), 16 (green), 21 (blue)

Lets say you pick number 21 which is blue. Because there is only one blue number in each house, if you pick the first house, they know your number had to be 21. Does that make sense?

the other stuff (pick a second color, pick a crystal ball) is just to distract you.