To say that 4D Toys is a game does not quite accurately describe it, as this is more of a toy box containing simulations and objects from the spatial dimension, although for the sake of this write-up, let’s stick to that definition.
For the most part, 4D Toys puts you in charge of a sandbox that lets players interact with various objects. And these aren’t just any objects we are talking about, as you have at your disposal hundreds of items that you will not normally (if at all) be able to interact with, such as a 600 sided dice. There is no real objective to the game, as experimenting with and manipulating these objects which imparts logic behind fourth-dimensional physics.
If things become too overwhelming, 4D Toys also includes a simple tutorial explaining how you can interact with these objects.