The BBC Micro conversion of Ultimate‘s classic Lunar Jetman is a very good one, using a high res display mode for the graphics, which are mostly monochrome (just like the Spectrum original).
The Commodore 64 version of Ultimate‘s classic Sabre Wulf was made by Greg Duddle of Mr. Micro for Firebird Software, who published the game in 1985.
The BBC Micro version of Ultimate Play The Game‘s classic Sabre Wulf is so chunky and garish that it hurts the eyes! That said: it plays well enough.
The MSX version of Knight Lore was developed by Tose Co. Ltd. for Jaleco and published in Europe and Japan in 1985.
The Amstrad CPC version of Ultimate‘s famous Knight Lore is the best-looking version, in my opinion.
The BBC Micro conversion of Ultimate‘s famous Atic Atac is a little on the chunky side graphically, but it plays pretty well.