-This guide covers Easy mode in depth. Normal and Hard Mode puzzle solutions are the same (except for 2 sections noted where it comes up) but number of aliens can differ on Disc 3.

-Finishing the game on Easy will not unlock Hard mode- must do it on normal.

-Save files for Easy mode in Resources, along with save file with Hard unlocked

-Differences between Easy, Normal and Hard mode save system (using the Voice Recorder battery) outlined below. There is no way to recharge it.

Easy: Start on 99. Saving costs 3, loading is free. Normal: Start on 64. Saving costs 3, loading costs 1. Hard: Start on 16. Saving costs 3, loading costs 2.

-Maze directions mean keep following path until have actual crossroads then take the next direction in the sequence. E.g. if the path has an L shape with no turnoffs it's not counted as "turn right"

-Maps have been uploaded with routes marked for the mazes. Not to exact scale for corridor lengths but layout and directions are right.

-Note: picking up any extra items or saving/loading with the voice recorder will change what is the first item displayed when you bring up your inventory

-Casual walkthrough and maps also available on GameFAQs https://gamefaqs.gamespot.com/saturn/197228-enemy-zero/faqs/80908

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Disc 1

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-Examine drawer unit in corner (Laura's keycard and voice recorder) -Examine lab equipment (VPS scanner) -Exit

-Take first right and enter Store Room -Use terminal in corner to unlock all doors -Exit -Take a right and take the next right -Straight until T junction, then left to Locker Room door -(Note: on Normal, the box in front when you start is for charging your gun) -Use Laura's keycard on Laura's locker (stair keycard) -Exit

-Turn left and head all the way south to the Stair Room door -Use stair keycard -Keep pressing forward to enter basement

-Follow path around -Turn left and enter Power Room -Use power terminal: first button and the last two buttons on then power -Exit and head straight through roller doors -Hug left wall through maze (except for the small open area) until can enter Parker's Room. Ignore proximity warnings, alien won't get you if you keep running and don't stray. There is a more direct route if look at the map but alien is always blocking it.

-Check drawers for Kimberly's code (0326) -Exit and hug right wall back through the maze until back through shutters. Ignore proximity warnings again, as long as stay running and don't stray. Coming back you can take the riskier direct route as alien can have moved.

-Head left back up to and through the Stair Room to the first floor

-Take first left and straight through to the T junction (ignore alarm warning) -Take the right into Mercer's room (door should be broken) -Interact straight away to Examine body (Mercer's hand) -Use Mercer's hand on keypad scanner -Interact with locker (gun) NOTE: If not playing on Easy, will need to charge gun in Locker Room first before going to Elevator

-Exit (recommend saving first) and take first right -Take first door on left towards Elevator -Kill alien about mid point of corridor -Enter Elevator (lose gun)

-After cutscene, immediately turn left and run to end of corridor -Look up (C and Up Arrow or L2 and Up on controller) and go through the vent

-Duct Maze Part 1 to Archives Right, right, left, straight, right (ride conveyer belt), left, right, enter hatch

-Use PC tower -Use monitor -Use PC tower again (blue keycard) -Go to locker and use blue keycard (get gun) -Use blue keycard on slot below vent to exit

-Duct Maze Part 2 to Tool Room Right, left, left, right, left, enter hatch (NOTE: CAN GO STRAIGHT TO EXIT ON EASY MODE AS GUN IS PRECHARGED WITH 3 SHOTS. HARD MODE GUN ONLY HOLDS 1 CHARGE.)

-Use gun on charge port -Password is "George" -Exit

-Kill alien and head to exit barrier: Right, left, left, left, straight (long walk), straight x2 to T junction, right, left and there should be an alien in this corridor right in front of the barrier on the left. Doesn't seem to roam or move from this position.

-Kill the alien, head back to recharge gun if empty (can use conveyor belt on the right while retracing steps to save time- turn right after getting off it)

-Enter elevator -Use Kimberly's terminal and do all of the following: Check personal file photo Call David Call George, Mercus, Ronny and Parker -Last chance to save here before Disc change -Call David again to trigger end of Disc 1

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DISC 2

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-Straight, right, right (through three red doors- long walk), left (up ramp), through doors -Enter Elevator -Set panel for floor 7 (all switches up) -Enter Ronnie's Room Keypad code: Down Up Down Up Down Up Down Up Up Down Down Up

-Walk around to PC -Logon to PC (Password: Sad, Netural, Dead- Up x 2, Down x 1, Up x 1) -View Aki file and scroll down to end -Exit back to Elevator

-Set panel for floor 5 (up, down, up)

-Right to George's Room -Talk to George (appears non-optional, David's room is locked until talk to George first) -Recharge gun -Exit and go across to David's Room -Look at photo -Head back and talk to George -David should now be in the basement storeroom (doing all the above is mandatory to trigger this event) -Head back to Elevator and select basement (all switches down)

-Go to Basement Storeroom Head northwest through corridor, left and immediately right, take second left and straight to the door. 2 aliens roaming, appears to be RNG for starting location. You can make it to the door sometimes by running as fast as possible- but have found consistently that walking will avoid aggroing the aliens. If done everything right, the outer door will be broken open and able to go straight in. If door is locked, need to go back up and check everything else is done.

-Charge gun on left if need to -Walk around the corner -Interact with David (computer chip) -Exit back to Elevator Head straight to T junction, turn right, straight until can turn left (and take it), immediate right and head diagonally to the door

-Set panel for floor 5 (up, down, up) -Go to George's room -Use computer chip on PC -Scroll all the way down through the text to trigger cutscene -Enter doorway but DO NOT exit to hallway- interact first (pickup key on ground) -Exit back to Elevator

-Set panel for floor 7 (all switches up) -Enter Ronnie's Room (MAY NEED TO SOLVE HERE DEPENDING ON DIFFICULTY) Keypad code: Down Up Down Up Down Up Down Up Up Down Down Up -Use key on body scanner in corner -Exit back to Elevator -Set panel for floor 5 (up, down, up)

-Enter David's Room -Walk around to the door and turn around -Interact with George TWICE (orange keycard mandatory, and code for Power Room on second one but solution is below) -Exit back to Elevator -Set panel for floor 6 (up, up, down)

-Head to Power Room (doors not listed here- just follow corridor until reach a junction then take option shown). 1 Alien here, near the end. Left, left, right, right, right, straight

-Use power terminal 180, 270, 0 (can actually just hit Enter by itself and it counts), 135

-Head to Elevator Straight, left, left, left, right, right -Recharge gun in George's Room (up, down, up) -Head to floor 1 (down, down, up) -Recommend saving before exiting Elevator -Head straight to door controls -Use orange keycard to trigger transition to Disc 3

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DISC 3

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Note: small enemies respawn but regular Aliens do not. -F1, head to F2 (1 Alien- go direct and don't stop, won't catch you) First right, left then right into elevator

-F2, head to F3 (1 Alien- go direct and don't stop, won't catch you) Straight until reach pillar, take first left and straight until elevator

-F3 to Safe Room (F4 junction point) Straight until reach pillar, take first right and straight until room

-Exit out far door to F4 (automatically picks up new gun with unlimited charges) SAVE BEFORE EXITING. NOTE: THIS IS THE ONLY SAVE SPOT UNTIL REACH F9 EXIT SO BE PREPARED TO BACK TRACK TO HERE

Note: Small aliens don't require fully charged shot to kill.

WARNING: SEEMS TO USUALLY BE A SMALL ALIEN CAMPING THIS DOOR IF LEAVE FLOOR AND COME BACK

-F4, head to F5 (small aliens only) Right, right, straight to elevator. Watch for small aliens at junctions- you should be able to hear them. If one passes a junction in front of you, wait as it WILL turn around and come back.

-F5, head to F6 Keep straight all the way until path turns right, take first left to elevator. 1 alien but if run (only stopping to shoot small alien if in the way) will never catch you.

-F6, head to F7 (2 Aliens, lots of small ones) SHORTEST: left, straight, right, left, straight to T junction, right and left SAFEST: Right, then keep going straight until reach elevator (not the most direct but this route seems to usually make the aliens always be in front of you for easier shots) If can kill both Aliens recommend going back to F4 restroom to save. Watch for small aliens at the junctions. This floor does seem to spawn more small aliens if both Aliens are killed.

-F7, head to F8 (3 Aliens, no small ones) Hug the right hand wall all the way to the elevator. There are 3 aliens here, one will definitely be in your way on this path, possible other one will come in behind you. Recommend going back to F4 restroom after each kill.

-F8, head to Boss (2-4 Aliens) (Recommend shooting any small aliens next to vent entrances as they can follow you in. If playing cautiously, every time you kill a regular alien go back up to F4 and save. Walking instead of running seems to stop regular aliens from homing in on you, but spawn points look to be slightly random)

Room 1: Straight across diagonally through the centre and enter vent (safer route: hug left wall and walk all the way around)

Room 2: Hug left wall and enter vent

Room 3: Hug left wall and enter vent

Room 4: Straight across and enter vent (Note: Usually if you stay in the vent before entering Room 4 you can shoot the alien in this room if hear proximity alarm)

-Head straight, killing boss enroute to F9 with one charged shot (warning- loud death noise)

-F9 to Winter Tower Straight to T junction, left, right, straight, left, right (Two Aliens in this section)

NOTE: CAN SAVE HERE- FIRST POINT AVAILABLE AFTER F4'S RESTROOM) -Use White Keycard on panel on right of door (this is the Stair Room in Winter Tower from Disc 1 again) -Forward through all lifts -Head to Parker's Room (same as Disc 1- follow path until T junction, right to go through roller doors and keep left. Will likely have to kill 1 of the 2 Aliens roaming. This time though can take the more direct route straight through centre as have gun) -Scroll through computer log -Exit and run back to lift. Either direct route, or safer way of hug right wall until back through the roller doors. Once through roller doors, take the left)

-Head all the way through the lifts back to the maze -VPS will lose power, no radar warning -Follow directions from intercom. When told "Enemy is near" don't try to shoot, just turn around and run to next junction and follow directions.

Game ends when run through open doorway and end cutscene plays (time is on first visible frame of the cutscene). On Hard Mode, a bonus cutscene will play.