The upper-left corner is bombs blown.

The top is health remaining.

The upper-right corner is your calculated time before the police disarms your bombs, might not be accurate.

The middle is what you have to type and what you have typed so far.

(The bottom is your score which serves no porpuse at the moment lol.)

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The COMPUTER is where you do all the business with the bombs.

The DOOR is an entrance for the police, defend it.

The WINDOW is another entrance, just remember it can only take a certain amount of shots before breaking, including your own.

The KITCHEN is located behind you and could be hiding some police, im not sure so keep an eye out.

The GUN WALL is your reloading station, plenty of ammo. It also holds 3 syringes to heal yourself.

The PHONE is where you can call Martinez, he'll take care of them for a while. But will probably have some business to do afterwards.