Advanced 3D Game Creation Engine (Split-screen, Controller Mapping, Game Modes)

I want to build a complex 3D shooter (similar to Roblox Hypershot) with: - Custom UI (Play/Exit, glowing buttons) - 4-player selection with Bot modes (Easy/Med/Hard) - Advanced controller detection/mapping (Keyboard/Mouse/Joystick) with drag-and-drop assignment - Team modes (1v3, 2v2, etc.) - Game modes: Capture the Flag & Deathmatch with specific rules (respawn, invincibility, flag mechanics) - Split-screen support (horizontal) - Weapon systems (Knife, Desert Eagle, M4) - Map-specific mechanics and team-based damage.