Andrew Braybrook of Graftgold took a keen interest in what other programmers were up to, and spent a lot of time working out how various effects were done.
In issue 71 (August 1994) of The One he explained some of the programming tricks used in the games Elfmania, Stardust (tunnel sequence), Galactic, Turrican 1 and 2 as well as Agony on pages 28 and 29.