Finish the game at least once. Begin a new game, and wait until the starting
sequence ends. After Rain leaves, you and Hana can be controlled for the
first time, you should see a small control pad on the left-hand wall immediately
after the screen switches. Walk up to it and the "Use" option should appear.
Press Triangle and enter one of the following codes.
At the small control pad enter "11692".
At the small control pad enter "61166" .
Big Head Mode:
At the small control pad enter "10397" .
On disk one, enter Left, Right, Up, Down, Down, Circle on the title screen.
The screen should flash red. Now you can access a library of concept and
development art (from the options, extras menu).
More Concept Art:
To get more concept art enter these codes at the title screen on these disks
disk2- Up, Up, R1, R1, R1, Square.
disk3- L1, R2, L1, R2, L1, Square.
disk4- O, O, Square, L2, Square.
Walking the Walk:
In the later stages of the game, you'll be forced to deal with monsters
that will appear out of nowhere. These creatures are released by stepping
in certain locations. You can train yourself to know the areas and not trigger
them, letting you pass almost unscathed.
The Boss Tip:
When you're tackling the end boss with Rain, keep toggling the weapon and
item select buttons between your three weapons. You'll be able to equip
the required weapon quicker this way.
There are a LOT of puzzles in Retro Helix that have their solutions explained
to you right before you do them, or the answers are on a wall opposite the
puzzle. Make sure you pay attention to everything in the game, especially
small details like wall hangings and verbal discussions, and never skip
Never Reload Assult Rifle Hana
Infinite Assult Rifle Ammo Hana
Infinite Shotgun Ammo Hana
Never Reload Shotgun Hana
Infinite Uzi Ammo Hana
Never Reload Uzi Hana
Infinite .90 Pistol Ammo Hana
Never Reload .90 Pistol Hana
Have Metal Hook Hana
Have Hacking Computer Hana
Have Fixer Piston Hana
Have Machine Cog Hana
Have Fixer Battery Hana
Have Drained Battery Hana
Have Wires Hana
Have Video Tape B Hana
Have Video Tape A Hana
Have Green Key Card Hana
Have Fixer Head Key Hana
Have Fixer Chip Hana
Have Yellow Key Card Hana
Have Mirror Hana
Have Mirror Segment Hana
Have Bandage Hana
Have Bell Hana
Have DNA Disk Hana
Have Blasting Caps Hana
Have Flash Disk Hana
Rain: Infinite Shotgun Ammo
Rain: Never Reload Shotgun
Rain: Infinite Uzi Ammo
Rain: Never Reload Uzi
Rain: Infinite Assult Rifle Ammo
Rain: Never Reload Assult Rifle
Rain: Infinite .90 Pistol Ammo
Rain: Never Reload .90 Pistol Ammo
Deke: Infinite GL 150 Ammo
Deke: Never Reload GL 150
Deke: Infinite Shotgun Ammo
Deke: Never Reload Shotgun
Deke: Infinite Assult Rifle Ammo
Deke: Never Reload Assult Rifle
Deke: Never Reload Shot Pistol
Deke: Have Peach
Deke: Have Phoenix Amulet
Deke: Have Genetic Marker
Deke: Have Diesel Fuel
Deke: Have Dynamite
Deke: Have Archeology Key
Deke: Have Machine Key
Deke: Have Elevator Lock Key
Deke: Have Ancient Gold Crank
Deke: Have Ancient Red Crank
Deke: Have Combined Mirror
Deke: Have Mirror Segment
Thanks to Revolution readers desdichado, Nick Bunzli and Deke!