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2-Player Arenas and Characters:
There are 10 hidden items that must be picked up in the single player mode to open the 10 locked 2 player arenas. There are 20 Arenas in all. Some of these hidden items, such as the Binoculars, are inventory items and others such as the Girly Mag and Dirty Laundry cannot be seen in your inventory when picked up.
There are a total of 28 characters, but only 10 of them are initially available. The other 18 characters are unlocked through 2 secrets in the latter half of the game. What they are is unclear at this time.
Free PDF and Online Strategy Guide
Detailed maps, 21 complete mission walkthroughs with screenshots, an in-depth weapons guide, and tons of tips. Now also available as a PDF download. Register here to access this guide for free.

Hard Mode:
In the in-game options menu, you can view movies that you have unlocked during your progress through the game. You'll see 2 extra movies that you couldn't get by playing through the first time. To unlock these movies you must play the game in 'HARD' mode and to get this mode, do the following. Go to the title screen and then New Game, press Up+Select+L1+R2+Square+Circle+X at the same time. Finishing certain levels on hard mode unlocks bonus movies.

Level Select:
Pause the game, highlight the "Map" option, then hold Right + L2 + R2 + Circle + Square + X (simultaneously). Then, enter the options screen and choose the "Cheats" selection.
Submitted by VAL
Mission Secrets, and what they unlock
 Mission 1 Colorado Rockies: When you find the H11 crate in the cave near the waterfall ravine you will unlock the "Colorado Rockies" arena.
 Mission 3 Colorado Interstate 70: When you get the Binoculars out of the crate in the back room of the first tunnel you will unlock the "Caves" arena.
 Mission 8 C-130 Wreck Site: Kill Archer with one shot as he rides the chopper (good luck) and you will unlock the "Jungle" arena. Also, if you beat this mission in less than 3 minutes you will unlock the Syphon Filter 1 characters for 2 Player mode.
 Mission 9 Pharcom Expo Center: When you find the Girly Mag in the locker you will unlock the "Pharcom Incubator Lab" arena.
 Mission 11 Moscow Club 32: If you kill all three body guards on the dance floor in the beginning before they toss grenades you will unlock the "Disco Basement" arena.
 Mission 12 Moscow Streets: get the PK-102 from one of the white cars that try to flatten you and you will unlock "Rhoemer's Bunker" arena.
 Mission 13 Volkov Park: If you can get to the first car before the agent blows it up you'll find a Biz-2 inside. This will unlock "Surreal" arena.
 Mission 15 Aljir Prison (Break-in): If you can make it through the whole level without the crossbow you'll unlock the "Aljir Prison" Arena.
 Mission 18 Agency Bio-Lab (Escape): When you enter the Operating Room you will unlock the "Agency Computer Lab" arena. You get to the Operating room by entering the ventilation shaft that you exited last in the previous mission -not the second one that leads out into the hallway.
 Mission 19 New York Slums: Find the Dirty Laundry in the washer in the burning building. This will unlock "D.C. City Park" Arena.
 Mission 20 Slums District: If you make it to the top of the stairway in the parking garage you will find a crate with an M-79 inside. This will unlock the Syphon Filter 2 characters for 2 Player mode.
Note: To view the following movies you must use the MOVIE THEATER code above.
 Unlock Bonus Movie 1: Play on Hard mode up to level 6, United Pacific Train.
 Unlock Bonus Movie 2: Play on Hard mode up to level 12, Industrial District.
 Unlock Bonus Movie 3: Play on Hard mode up to level 17, Agency Bio-Lab.
 Unlock Bonus Movie 4: Complete the game on Hard mode

Submitted by IGNguides

Super Agent mode:
Pause game play and highlight the "Weaponry" option. Then hold Select + L2 + Circle + Square + X (in that order). A sound will confirm correct code entry. Enter the options screen and select "Cheats". Super Agent mode allows enemies that have flak jackets to be killed with a single shot.
Submitted by Fozzy

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Page Updated Mon Jul 10, 2000 12:15pm EDT