This (the larger border) led to the false argument that this was the CPC resolution and therefore it was inferior to the Spectrum one, although the amount of pixels on the screen is EXACTLY the same.
While some Spanish companies reduced the screen in order to get the game better running in low-spec 464(but also because actually they commited speccyports... quite often...), the infamous speccy ports just ran a reduced screen so the ZX Spectrum's code and graphics could run almost "unchanged".
==Monochromatic playfield and Sprite Masks==