* BadExportForYou: The North American [=PS1=] port of ''[=RayStorm=]'' prohibits you from ever seeing easier versions of stages 5 through 8, due to those stages being cut out if any stage's difficulty is lower than the default. Just to rub salt in the wound, this version's default difficulty was also raised two levels above its Japanese counterpart, meaning you cannot play on Japanese defaults without beeing locked out of the second half of the game. You can blame Creator/WorkingDesigns for this.
* {{Cancellation}}: ''R-GEAR'' was scrapped for ''[=RayStorm=]''[='=]s place.
* FanNickname:
** While ''[=RayCrisis=]'' is the only game in the series that wasn't officially named "''Layer Section''" in Japan, fans sometimes refer it as ''Layer Section III''.
** ''R-GEAR'' has been dubbed by fans as "''[=RayForce=] 1.5''" as the only trailer for the game showcased some of the ideas that could have been implemented into this game was later used for ''[=RayStorm=]'' instead, while having the same 2D visuals of ''[=RayForce=]''.
* MarketBasedTitle:
** ''[=RayForce=]'' (JP and NA, arcade and iOS), also known as ''Gunlock'' (EU, arcade), ''Layer Section'' (JP, Saturn; NA, Windows 95), and ''Galactic Attack'' (NA, Saturn).
** ''[=RayStorm=]''[='=]s Japan-region [=PlayStation=] and Saturn ports are called ''Layer Section II'', but the original name is kept in all other versions.
** ''[=RayCrisis=]'' is the OddNameOut as it is the only game in the series that wasn't officially named ''Layer Section'' in Japan.
* NoExportForYou:
** The PC ports of ''[=RayStorm=]'' and ''[=RayCrisis=]'' were released in Japan and Europe, but never to North America. Thankfully they can run on Windows computers without having to change the regional Unicode settings of your PC, thus making them import-friendly... [[KeepCirculatingTheTapes if you can find copies of these games in these times]] (especially ''[=RayCrisis=]'').
** The ''Simple 1500 Series Vol. 75: The Double Shooting: [=RayStorm=] × [=RayCrisis=]'' compilation was only released in Japan. The [=PlayStation=] Network re-release of these games also stayed there.
** The [=PlayStation=] 3 version of ''[=RayStorm=] HD'' was released only in Japan.
* WhatCouldHaveBeen: ''[=R-GEAR=]'', a true sequel to ''[=RayForce=]'' was originally planned until the development of ''[=RayStorm=]'' took its place.
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