This game tests the player's ability to time the position of a moving bubble.
To begin playing, click the Astro-Exam test sheet in the middle of the screen when the moving gray bubble is inside the stationary bubble with the pink border. This will reward you points and move the moving gray bubble to the next row. Continue doing this for all ten rows.
Matching the moving gray bubble to a bubble with a pink border is worth full points, and matching the moving gray bubble to a normal bubble adjacent to a bubble with a pink border is worth half points.
The player can control the game using either their mouse's cursor or the keyboard. Using the keyboard-control mode, the space bar button does the same action as clicking the exam sheet and number keys one through six can change the difficulty.
Setting higher frequencies for the moving bubble award more points, and setting harder patterns for the moving bubble award more points.
The player gets a random amount of "extra" points added to their score at the end of each exam.