This mod, created by MizoreYukii

Project Spiral is a mod for The Sims that adds functional spiral staircases. These stairs use animations for sims traveling between floors, avoiding the usual elevator teleportation. The mod is base game compatible and easy to use, with sims interacting with the stairs like standard EA stairs. While currently only visually suitable for the shortest wall height, sims can still use them to access any floor. A future update will include support for varying wall heights. Players can place multiple spiral staircases, and floor cutouts are automatically created and adjusted. They can also be stacked on top of each other, allowing sims to continuously climb to multiple floors.

User With in Mod:

• Simscolony Translation Thai Localization [DEMO]
• Functional Spiral Staircases by MizoreYukii