- This is by no means an end-all be-all, objective list that claims any sort of scientific accuracy. I've cleared every game that is listed there, but I might have had an easier time with some games you might find harder or vice versa. A 2 point game could probably just as well be a 1 point game or perhaps a 3 point game. Almost everyone should be able to agree that a 3 point game is considerably easier to clear than a 9 point game, however.
- Speaking of the points: 1 is obviously the easiest, 10 is the hardest. Since there are some impressively accurate arcade ports in there (Gradius II, R-Type, Side Arms, Xevious for example) it should give you a general tendency on how they stack up with arcade games. A 10 would roughly translate to a 20-24 on the Japanese wiki (I'd argue that the hardest games on this list are about as hard (if not harder) as the arcade Raiden with autofire which is listed with 24 points).
- My crucial criterion for the ranking is how easy/hard it is to clear the game on the default settings (unless it starts on Easy, I specify the difficulty setting in this case). Internal autofire (even if it is set off by default) is always on, in case of the PCE even external autofire. I notice the usage of external autofire for the few MD games where it matters. I'll notice the region whenever it is important (mostly for the MD Toaplan games). When a game lucratively rewards you for playing it on one life I'm probably going to rate the difficulty of a 1LC instead, but I'll make sure to include the rating for a regular 1CC, too.
- I do include several hybrids and, of course, multi-directional shooters. No fixed vertical shooters outside of Galaga '88, though. I also don't care for those bundle cartridges like Action 52 or Williams Arcade's Greatest Hits (and yes, this also allows me to skip the SFC Star Force, thank heavens


- The second loop of both Detana!! TwinBee and Pop'n TwinBee is completely ridiculous, much harder than everything else on this list. Grind Stormer's second loop is also extremely difficult.
Hopefully I didn't forget any game, I'll look over it later. Please note if you miss anything or find shameful spelling errors!
1:
Spoiler
Battle Mania/Trouble Shooter
Battle Mania Daiginjou
Coryoon
Daioh Gale
Final Soldier
Magic Girl
Power Gate
Psychic Storm
Star Parodier
Sylphia
Spoiler
Arrow Flash
CD Denjin - Rockabilly Tengoku/Super Air Zonk: Rockabilly Paradise
Dangerous Seed
Darius Alpha
Darius Twin
Flying Hero: Bugyuru no Daibouken
Gadget Twins
Gleylancer
God Panic
Hawk F-123
Heavy Unit (MD)
Märchen Adventure Cotton 100%
Mega SWIV
Ordyne
Override (+1 for 2-ALL and more)
Raiden Densetsu/Raiden Trad (SFC)
Rock-On (after figuring out how the hell to proceed in the stages)
Slap Fight
Slap Fight Special
Spriggan Mark 2 - Re-Terraform Project
Super Aleste/Space Megaforce
Super Fantasy Zone
Tenseiryu: Saint Dragon
Terraforming/Syd Mead's Terraforming
Thunderbolt II
Winds of Thunder/Lords of Thunder (both PCE CD & MCD/SCD; the latter is a tad bit easier but not enough to rectify a different rating; +1 for Super difficulty on the MCD; -1 if you spam bombs)
Spoiler
Atomic Robo-Kid Special
Axelay
Choujikuu Yousai Macross 2036
Cotton - Fantastic Night Dreams
Crying/Bio-Hazard Battle (with external autofire (or by playing the US version that comes with autofire by default))
Curse
Dead Moon
Divine Sealing
Elemental Master (+1 for Mania)
Fire Mustang
Gate of Thunder (1LC; -1 for a regular 1CC)
God Panic (2 loops)
Gradius
Gradius III
Gunhed/Blazing Lazers
Hana Tahka Daka!? (good ending, -1 for the lesser ending)
Heavy Unit (PCE)
Hellfire (MD, Easy)
Insector X
Jikkyo Oshaberi Parodius
Kiki Kaikai: Tsukiyozoushi/Pocky & Rocky 2
Koutetsu Teikoku/Empire of Steel (NMNB; -1 for a regular 1CC)
Musha Aleste
PC Denjin - Punkic Cyborgs/Air Zonk
Pop'n TwinBee (if played at least somewhat for score; -1 if played for survival)
Rayxanber III
Rendering Ranger R²
Salamander (Beginner; +1 for Expert)
Seirei Senshi Spriggan
Soldier Blade
Super Star Soldier
Super SWIV/Firepower 2000
Thunder Force III (1LC; -1 for a regular 1CC)
Thunder Spirits (1LC; -1 for a regular 1CC)
Toilet Kids
Toy Shop Boys (subsequent loops don't add anything as they're identical to the first one with the exception of the omitted final stage which is the only one that puts up a fight)
Uchuu no Kishi: Tekkaman Blade
Verytex
W-Ring: The Double Rings
XDR – X-Dazedly-Ray
Spoiler
BioMetal
Cho Aniki
Choujikuu Yousai Macross: Scrambled Valkyrie
Darius II/Sagaia (1LC; -1 for a regular 1CC)
Darius Force/Super Nova (route ending with O zone, -1 for N & L)
Daisenpuu (PCE)
Daisenpuu Custom
Down Load
Fantasy Zone
Forgotten Worlds (MD)
Gokujou Parodius (including Special stage; +2 if you beat the Special stage with a character that is not Dracula-kun or Soitsu; -1 for not beating the Special stage)
Gynoug/Wings of Wor (Normal difficulty in case of Wings of Wor)
Hani in the Sky
Heavy Unit (PCE, 2-ALL)
Hellfire S (Normal)
Kiaidan 00 (perhaps one more point if played for score)
Koutetsu Teikoku/Empire of Steel (Hard, NMNB; -1 for a regular 1CC)
Magical Chase (if played at least somewhat for score; -1 if played for survival)
Nexzr
Paranoia/Psychosis
Phalanx (Normal, 1LC; -1 for a regular 1CC)
Phelios (Advanced Course)
Salamander (Beginner, 2 loops)
Same! Same! Same!/Fire Shark (MD, Normal)
Senjou no Ookami II/Mercs (Original mode)
Slap Fight (4 loops)
Strike Gunner S.T.G (Normal/2)
Super Airwolf/Crossfire
Super E.D.F./Earth Defense Force (note that the US version is slightly more difficult, it's also the one I'm familiar with; I doubt that the SFC version is a whole point easier, though)
Super Fantasy Zone (2 loops)
Super R-Type (Normal)
Terra Cresta II
Thunder Force II
Twinkle Tale
Uchuu Senkan Gomora/Bio-Ship Paladin (with external autofire; probably +2 or +3 without it)
Xevious (Fardraut mode)
Zero Wing (MD, Normal)
Spoiler
Atomic Robo-Kid (Normal; no external autofire, -1 with it)
Axelay (2 loops)
Bari-Arm/Android Assault
Barunba
Bouken Danshaku Don: The Lost Sun-Heart
Cosmo Gang: The Video (no external autofire)
Crying/Bio-Hazard Battle (Hard; with external autofire (or by playing the US version that comes with autofire by default))
Daisenpuu/Twin Hawk (MD, Easy)
Darius Plus
Deep Blue
Detana!! TwinBee (if played at least somewhat for score, ranking can go up to 10 when played with a great score in mind; -1 or -2 if just played for survival)
Down Load 2
Earth Defense/The Earth Defend
Forgotten Worlds (PCE; using what is probably an unintended safespot against the final boss; +4 or +5 if you play against that guy normally, I've no idea how you're supposed to outlast him in this version)
Gaiares
Galaga '88/Galaga '90 (ending in the fourth dimension; -1 for any other dimension)
Gradius (2 loops)
Gradius II
Gradius III (2 loops)
Gynoug/Wings of Wor (2 loops; Normal difficulty in case of Wings of Wor)
Hellfire (MD, Hard)
Kiki Kaikai: Nazo no Kuro Manto/Pocky & Rocky
Kyuukyoku Tiger (PCE)
L-Dis
Mr. Heli no Daibouken (Normal Mode)
Parodius Da! (PCE)
Psycho Chaser
R-Type III: The Third Lightning (Shadow Force)
Rabio Lepus Special
Rayxanber III (Maniac)
(Hyper Dyne) Side Arms (Special; both the regular game and the Before Christ mode)
Slap Fight Special (4 loops)
Sol-Deace & Sol-Feace
Sonic Wings/Aero Fighters (+2 if you use a character that is not Rabio)
Super Darius
Super Darius II
Uzu Geobukseon/Keobukseon
Viewpoint
W-Ring: The Double Rings (2 loops)
XDR - X-Dazedly-Ray (2 loops)
Xenon 2 Megablast
Xevious (Arcade mode)
Zero Wing (PCE)
Spoiler
Burning Angels
Cotton - Fantastic Night Dreams (2 loops)
Cyber Core (1LC; -2 for a regular 1CC)
Darwin 4081 (Normal)
Dimension Force/D-Force
Dragon Saber
Eliminate Down (1LC; -2 for a regular 1CC)
Final Blaster
Ginga Fukei Densetsu Sapphire (+4 for a NMNB with an advanced score; this is by far and most the most interesting 16-bit game as far as scoring is concerned, and hard to pull off, too)
Gokuraku! Chuka Taisen
Hellfire (MD, Easy, 3 loops)
Image Fight II
Jikkyo Oshaberi Parodius (2 loops)
Keio Yuugekitai/Keio Flying Squadron
Kidou Soukou Dion/Imperium (-1 for the US version Imperium)
Master of Weapon (Normal)
Mr. Heli no Daibouken (Arcade Mode)
P-47 - The Freedom Fighter
Parodius Da! (SFC)
R-Type (Complete CD)
Raiden (PCE)
Salamander (Beginner, 3 loops/Expert, 2 loops)
Same! Same! Same!/Fire Shark (MD, Normal, 2 loops)
Senjou no Ookami II/Mercs (Arcade mode)
Silpheed
Slap Fight (8+ loops)
Super Fantasy Zone (3 loops)
Super Raiden (mostly due to the new final stages; +2 for every subsequent loop)
Task Force Harrier EX
Thunder Force IV (1LC; -1 for a regular 1CC; note that the US Lightening Force has an easier Gargoylediver fight)
Undeadline (1LC)
Vapor Trail (Hard)
Whip Rush (1LC; -2 for a regular 1CC; external autofire makes it a tad bit easier, but not enough to warrant a different rating)
Spoiler
Daisenpuu/Twin Hawk (MD, Hard)
Dennin Aleste/Robo Aleste
Dragon Spirit (mostly due to that darn final stage & boss)
Gradius (3 loops)
Granada (Normal)
Kiki Kaikai
Kyuukyoku Tiger/Twin Cobra (MD)
Raiden Densetsu/Raiden Trad (MD, Normal; +3 for beating the Special Stage - thanks a lot for your brilliant video, pegboy!

Super R-Type (Normal, 2 loops)
Tatsujin (PCE)
V-V
Violent Soldier
Zero Wing (MD, Normal, 2 loops)
Spoiler
Gradius III (3 loops)
Grind Stormer
Hellfire (MD, Easy, 6 loops/Hard, 2 loops)
Kyuukyoku Tiger (PCE, 2 loops)
Image Fight (Leader Class)
Salamander (Beginner, 4 loops/Expert, 3 loops)
Same! Same! Same!/Fire Shark (MD, Normal, 3 loops)
Spriggan Powered
Steam-Heart's
Super Fantasy Zone (4 loops)
Tatsujin/Truxton (MD; I know most people think that the PCE version is harder, but the final stage is much, much more challenging on the MD)
Undeadline (Crazy, 1LC)
Spoiler
Gradius III (4+ loops)
Kyuukyoku Tiger/Twin Cobra (MD, 2 loops)
Metamor Jupiter (Expert)
R-Type III: The Third Lightning (2 loops, Shadow Force)
Rayxanber II
Slap Fight Special (8+ loops)
V-V (2 loops)
Zero Wing (MD, Normal, 3 loops)
Spoiler
Battle Squadron (with external autofire, don't even try to play this game without it, heck, don't play this game, period)
Gradius (4+ loops)
Gradius II (2 loops)
Legion (longer route; the shorter route is even harder since the ridiculous stage with all the almost-instant laser beams is the penultimate one here which means that you have to survive the final stage with almost no resources)
Salamander (Expert, 4+ loops)