A walkthrough of the Belarus ZX Spectrum game, Klad: Chast' 1 (Treasure: Part 1). A Lode Runner type game from 1994. Avoid the guardians who follow your movement and collect the white chests until the key appears, after which you can exit through the pink door.
From the recording originally sent by Albert Valls to http://www.rzxarchive.co.uk/ . Recorded using "rollback", a feature of the emulator which allows you to mark a point, which you can then roll back to later if you get into difficulty, and try again. More info. on the channel "About" page: https://www.youtube.com/user/rzxarchive/about