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OK, automatic detection does not really work. Instead I uploaded a .sna and a .tap file with a version for the Kempston joystick.
Only use this if you attach a Kempston joystick otherwise you might notice random movement.
The joystick supports only the first player and allows for 1 button only.

Today (20.12.2025) I needed more than a year but now I updated the sna and tap files with v2.2-rc1. You should be able to use the Kempston joystick now on the ZX Spectrum version. The detection is automatically. Please let me know if it works for you.

The layout is because of the Interface II support.
I honestly don't hink that it is really playable without joystick.

I didn't expect such a great response. Many thanks for that.

If you're interested, I could keep a hiscore table here on the site. Just add a photo of your score in the comments. If there are enough entries I assemble something.

Tranks for the video. I'm glad to see that you have fun with the game.
A tip: To revive your wingman you have to collect (touch) the "+1".

Great conversion!!

I'm using it in a MAME cabinet and I would also like to handle the hiscores (MAME can readout the values of certain addresses and store them in a highscore file).

For this to work I would require the address where the highscore is stored.

Could you maybe post it.