JNG is not just a simple shoot 'em up game. You destroy enemies here, but you also earn money for your actions and you have to invest it wisely to improve your firepower and ship. Your fighting skills and your decision about equipment are equally important for the success.
You can spend your hard-earned cash during shopping breaks you enter in between fighting missions. Here you can equip your ship and save your current position. After the start of a new campaign you will appear on your first destination and the first shopping break: a small cosmic restaurant. Buy and upgrade guns here before you enter the upcoming battle!
When you enter the shopping break, the menu will appear automatically. You will find menu options on the right side of the screen and your ship's equipment on the left side.
The right picture shows your ship surrounded with slots for the equipment. You begin your quest with a small green fighter offering just two slots for FRONT weapons and a small series of internal special devices (some of them inactive). You also have one machine gun in your lower FRONT slot. It is a weak gun on a first level, so you will have to do some shopping before you start your fighting action. Soon you will get a more destructive warbird with more slots for guns and more devices.
Lower left corner shows basic displays of your ship: hull integrity (H.I.) to the left and weapon heating to the right. You die when your H.I. drops to zero. You cannot shoot for a short time when your inner heat reaches the maximum.
Above the displays there is a testing button. Press this button or just press 'ESC' or 'P' on the keyboard to leave the menu and fly in free space. There are training targets flying all over the place. You can check the speed and manoeuvrability of the ship here or the power and rate of heating of your weapons. Feel free to experiment – training targets cause no damage. You can return to the menu anytime by pressing 'ESC' or ''P' again.
Below the displays and T-button is your cargo. You collect guns and other ware here. Left and right arrow button shift the cargo, when the number of items exceeds 8. There is a "remove all" arrow (pointing down) on the right side. Use it to drop all weapons from ship's slots to the cargo or press the CTRL+R key.
In the upper right corner there is a menu with four tabs in this order left to right:
campaign, weapons, missiles/bombs and ships
In the campaign tab you

- start the next mission by selecting the "Start Level" button
- load the current position by selecting the "LOAD GAME"
- save the current position by selecting the "SAVE GAME"
- adjust game options
- quit the campaign into the intro titles by selecting the "END CAMPAIGN" button.

In the weapon tab you access the weapon supply of the place you are currently located. Here you improve your war equipment.
In the missile/bomb tab you access missiles and bomb supply.
In the ship tab you can exchange your current ship for a better model.