Here's a list of the best sandbox games of all time. In this top you will find not only hits with advanced graphics, but also undemanding games that are perfect for weak PCs.
Sandbox is a translation of the English name for the sandbox genre. In a broad sense, a sandbox refers to a game in which there is no end goal or one that is not required to be completed. Such games have a non-linear structure, and the player himself decides what to do. Typically, sandbox games take place in an open world. That is, the player finds himself in a kind of playground or sandbox, where he can interact with objects, collect resources, build buildings, etc. For example, Garry's Mod is a physics sandbox where the player can do all sorts of tricks.
Some story-based games also have sandbox elements. A striking example is the GTA series, where the player is free to go about his business at any time, ignoring plot tasks.