GO SYSTEM Engine is the most complete top-down solution It is the best framework whether you are new to Unity, or an experienced developer. Clean code, good practices, optimizations, and a solid foundation allow creating 3D games. It's very fast, and it works on desktop, mobile, and anywhere you want. It's packed with features, built on player feedback and a great feel to the game at its core, and constantly updated, it's the best tool for creating a 3D game that you'll really be satisfied with.

Professional systems for your 3D game on the Unity engine setup it with one click

you need GoSystemsCharacter Controller In this package

Ladder And Pipe Climb system