To determine the number of centicubes that need to be added, we need to consider the volume of each centicube and the total volume of water added (25ml or 25 cubic centimeters).

Volume of 1 centicube = 1 cm x 1 cm x 1 cm = 1 cubic centimeter

Number of centicubes needed = Volume of water added / Volume of 1 centicube

=>Number of centicubes needed = 25 cubic centimeters / 1 cubic centimeter

=>Number of centicubes needed = 25

Therefore, we need to add 25 centicubes to the measuring cylinder of water to raise the level by 25 milliliters.