Stack games are an exciting subset within video game categories that involve stacking or arranging items to create structures such as towers with blocks (like "Tower Defense"), stacks for puzzles like the Tower Racing Challenge in The Sims 4: City Edition, and more complex stack-based challenges. Players usually start by selecting a starting height from which they can build their tower. They then add new pieces one at a time until it reaches its desired size or is completed with all of them stacked on top (e.g., "Tower Defense" where players must place blocks in order to create the tallest possible structure). The game often includes various obstacles and challenges that require strategic thinking, such as stacking items so they don't fall off when trying to complete a level. Stack games are typically fast-paced with quick moves required for optimal performance.