Last Christmas I found a formula to help with wrapping presents .

This year the BBC reports a fomula for fun derived by toy expert Barry Eldridge. The formula is:

0.22a + 0.17f + 0.153n + (0.12c - 0.1g) + 0.1s + 0.09e + 0.06d + 0.054l + 0.05m + 0.011c = pfg

Where pfg equals “perfect family game”.
a = age range
f = fun factor
n = number of people
c = competitive factor
g - argumentative factor
s = stimulation
e = engagement
d = duration
l = longevity
m = mobility
c = complexity

So - when all the numbers have been crunched, the factors weighed and the wind speed taken into account - which game comes out on top?

“A pack of cards,” says Mr Eldridge, with a pfg rating of 98%.