John Smith Legacy 
Gradius Home World 
GameStone 
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Games 
Gradius
Salamander
Parodius
TwinBee
3 Dual Screen
Arcade
CBM C64
CPC 464-6128
Dual Screen
Famicom
Game Boy
Game Boy Advance
i-mode
LCD Game
MSX
PlayChoice 10
PC88-5INCH
PC Engine
PlayStation
PlayStation 2
PlayStation 3
PlayStation 4
PlayStation Portable
PlayStation Vita
Super Famicom
Saturn
Smart TV
VS System
Wii
Wii U
Windows
X1
X68000-X68030
Xbox 360
ZX Spectrum
There are no Gradius related games available for this region
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Translation: ZX Spectrum
A very popular if average UK manufactured computer. I was a C64 man myself so I have not played many games on this system but people seem to hold it in high regard.