The game world consists of one or more levels consisting of grids. There are several items of various kinds on the grids, and there are free grids regardless of the presence/absence of stacks. A stack of items consists of items that can be stacked with each other. The player has the ability to move objects to neighboring grids, including to create stacks. When selecting an object, a group of objects is highlighted that are not separated by free grids, and when re-selecting, the interaction of objects is triggered. Interaction with individual items is prescribed for individual items, even if interaction is available for 3 or more items at the same time. If an item can interact with multiple items, it cannot interact with one. Interaction with the stack/stacks is available, even if not all items from the stacks have an interaction option. There are rules for interacting objects, according to which some are deleted, some are replaced on the same grid. It is forbidden to replace items from the stacks to other grids.

Is this the same thing you said in your other thread? Why didn't you just continue in the other thread?

This thread is locked as redundant, especially since further discussion exists in the other thread. If you @nosey can't find the other thread, go to https://www.gamedev.net/forums/forum/19-game-design-and-theory​ and find it.