After starting the game, click on the button at the bottom center of the screen. Targets will appear on a 4x4 square map. You need to remember their location. After 5 seconds they will become invisible.

After that, you will fire at them by clicking on the cells in which you saw them. When the target is hit, it will become visible.

The ratio of the number of destroyed targets to their total number is shown in the upper left part of the screen.

The number of shells at your disposal is shown in the upper right part of the screen. Initially, their number is equal to the number of targets + one spare projectile.

When you have destroyed all the targets or used up all the ammo, restart the game by clicking on the button at the bottom center of the screen.

You can select the map size from 3x3 to 6x6 using the buttons at the bottom left of the screen.

You can set the time allotted for remembering the locations of targets using the buttons at the bottom right of the screen.