Firstly this allows for an animated solution to a problem which I posed at a puzzle site some years ago. Secondly, your instructions are on the opening screen. At this point I have not been able to exclude invalid moves. Should you make one, then please reset the "game".
My first attempt with this proving exceptionally difficult and so had to begin to understand "cloning". While Digimath provided some early advice in that early endeavour, I realised his greater contribution from scripts when he remixed my "Peg Solitaire" as "HI-Q". (https://scratch.mit.edu/projects/119078899/#comments-64021371) Apart from scripts, this project has the opening splash screen, a background as the "lock" body, a set of 30 black clones which represent both the inner background of the "lock" body as well as providing reference points for the relocation of the 13 sliders. Two other sprites indicate your status. While I have no intentions of doing so, I perceive that someone could build a multi-level challenge from this with a few modifications. Other than my black clones (which are square), my sprites are oriented horizontally and vertically. Rather than creating multiple sprites my thought would be to make: a) a black sprite for a cloned background, b) create a "Key" and "Latch", c) create 4 sprites (more if required), but are a 2x1 horizontal, a 3x1 horizontal, a 2x1 vertical and a 3x1 vertical [which I did not use]. d) create several costumes of each of "c" (For instance, in my offering #1 and #2 would be clones under different costumes). Lastly, if I understood Digimath's scripts fully I'd understand invalid moves exclusion. Before playing follow this sequence exactly: , and black space directly left of "2". Reset and try , and black space directly left of . Problem!! Can't change your mind!