Heads-Up Display (HUD) Elements
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6. Object Detection Light
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8. Keys Collected (colors correspond to doors)
Using the Inventory
Press the R1 button to bring up the Inventory. Use the Directional buttons to move the highlighting effect through the contents.
When the item you wish to use is highlighted, release the Directional button and your choice will be implemented.
Inventory Icons
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Projectile Weapons: the left hand icon indicates single, double, or triple shot weapon.
Using Doors
Most doors will open as you approach them. However, there are other doors that are not as co-operative.
You may need to go into the HUD and choose a key that you picked up on the way. Or there may be an obstacle in the way of a door, in which case you will have to figure out a way of removing it. Or you may have to solve a small puzzle to open the door.
Pick Ups
Some of these come in handy for completing a level. To collect a pick up, simply walk over the item and you will instantly add it to your collection of incredibly useful stuff.
Cubes
Some bad guys drop these as you liquidate them. Pick them up and when you have amassed enough your mighty morphin' weapon will grow bigger and more powerful.
These can also help you upgrade your radar.
Shield
Boost your shield.