start by calling
Range := 100;
Random(range);
Each value will be in the range 0..100 Disgard totals > 100
e.g random genarate 60,10,20 and 2 = 92 difference is 8 / 4 = 2 gives
62,12,22 and 4 = 100
As the game progesses reduce the value of range towards 25.
and apply the addition.
e.g
5,2,8,5...