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Sorry about the delay in replying, I was off on holiday and didn't have access to my The Spectrum. Can confirm that 1.09 (Plain Loader) works like a dream on the "Retrogames The Spectrum". Thanks!

Ones supplied with the retrogames The Spectrum. Thanks for quick reply but won't be able to test it for a week or so as currently away from home.

1.03 doesn't work on Retrogames "The Spectrum" which is a shame :( , just a black screen. Space then takes you to a "Break in Program" prompt

Anyway, here's Hard mode

Despite the border being 1px wide the whole 8x8 area is the collision zone which can give the impression that the game hasn't responded to input. This isn't how I would have designed it, but it is part of the original design from 1983 so I kept it.  The control system feels a lot sharper on a joypad btw which is how i play it (Xbox One controller on Fuse, Switch controller on Retrogames The Spectrum). It's supposed to be fast to make it tricky :). Keyboard input is checked every single game loop, one game loop = one step.