Math Applet #2 How Many Under the Shell

Information: How many under the shell http://illuminations.nctm.org/ActivityDetail.aspx?ID=198
Summary: The menu allows players/students to select how many bubbles the game will start with, or a random number can be chosen. Students then pick if they would like subtraction or addition problems, a mixture of both can be choosen as well. After the initial set-up, a bubble with a number in it appears and covered by the shell. Numbered bubbles are added or taken away from the shell, but are all still hidden by the shell. The equation is in the top right corner for students to refer to, but no manupultives to count. The game repeats itself like this.
Critique: I did not like this math applet as much as the "grouping and grazing" for a few reasons. There were not as many different oppurtunities for learning (only addition and subtraction) and the format was slightly confusing. Not being able to touch the screen and count the bubbles (having them hid under the shell) might be hard for Pre-K and K, although it might have been better for first and second grade, because they could more easily use the equation.