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IF YOU ARE STILL TRYING TO FIGURE OUT THE KEY TO THIS, DO NOT READ FURTHER
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What determined the numerical value of the game names?
The number of enclosed spaces in the letters as they appear in standard uppercase.
The letters A, D, O, P, Q, and R each have 1. The letter B has two.
So the value, x, to be determined was given as:
x = ( [ (FROGGER) * (GRAVITAR) ] / [ (SPACE INVADERS) * (KRULL) ] ) * (ZOOKEEPER)
First, let's actually color code the parentheses for clarity. The parentheses that have no others embedded in them will be red, the parentheses (shown as square brackets) that only have red parentheses in them will be blue, and the ones that have the blue brackets in them will be green.
x = ( [ (FROGGER) * (GRAVITAR) ] / [ (SPACE INVADERS) * (KRULL) ] ) * (ZOOKEEPER)
Now let's substitute the values:
FROGGER = 3
GRAVITAR = 4
SPACE INVADERS = 5
KRULL = 1
ZOOKEEPER = 4
which gives us:
x = ( [ (3) * (4) ] / [ (5) * (1) ] ) * (4)
We can now remove the red parentheses as they don't contain any expressions:
x = ( [ 3 * 4 ] / [ 5 * 1 ] ) * 4
Then do the arithmetic in the blue brackets:
x = ( [ 12 ] / [ 5 ] ) * 4
The blue brackets now don't contain any expressions and can be removed:
x = ( 12 / 5 ) * 4
Then do the arithmetic in the green parentheses and remove them(I'll use decimal notation for the fraction):
x = 2.4 * 4
And finally.
x = 9.6
QED