Road to Exile is an action role-playing game developed by Grinding Gear Games, a New Zealand studio. In the game, players can explore a dark and cruel world and improve their role strength by defeating monsters and completing tasks.

In the game, the firm square is an object type, which is a gem. Sturdy squares can be inserted into the socket of items, providing additional attribute bonus for the player's role. These attribute bonuses can be increased damage, health, armor and so on. Steady diamonds can usually be obtained by fighting monsters, completing tasks or buying.

It should be noted that the properties and names of the items in the game may be adjusted in different versions of the update, so the specific properties of the solid box may be different.