A walkthrough of the ZX Spectrum game, Riptoff Plus. A Repton-like game from 1991, which was originally published on a Your Sinclair magazine covertape. This video shows the 15 levels bundled with the editor first, and then the 15 normal levels (with the bonus levels between them).
From the submitter, Paul E. Collins: "I used rollback and infinite lives; I can't believe any human could complete the game otherwise. Infinite lives are not abused to skip through puzzles -- only to deal with the ridiculous number of chaser monsters in some levels."